If we were able to artificially alter the membrane permeability of pacemaker cells so that calcium influx is blocked

Answers

Answer 1

Answer:

The Heart rate would decrease

Explanation:

The Heart rate is expected to decrease, as calcium influx in blocked , since the threshold membrane potential can not be reached so quickly so the action potential will take place in longer time leading to decreased heart rate.


Related Questions

Why are leaves of water lily coated with wax on the upper surface?

Answers

Answer:

The wax creates an outer layer of zero friction surface helping the water lily leaves float on the water surface, the wax also creates a shiny coating that reflects and lowers the temperature of the water and also prevents water loss by evaporation and helps in prevention of other plant diseases.

Explanation:

Anya and Greg are working in their research laboratory. Anya tells Greg that one of the mice has a 50% probability of having the alleles DD and a 50% probability of having the alleles Dd. How can Anya explain her reasoning? In two out of 50 times, the mouse has the alleles DD or Dd. The probability that the mouse has the alleles DD is equal to the probability that it has the alleles Dd. The mouse is twice as likely to have the alleles DD than it is to have the alleles Dd. There are two more possible outcomes besides the mouse having DD or Dd alleles.

Answers

Answer:

Option B: The probability that the mouse has the alleles DD is equal to the probability that it has the alleles Dd.

Explanation:

Anya tells Greg that one of the mice has a 50% probability of having the alleles DD and a 50% probability of having the alleles Dd.

She can explain her reasoning by saying that both pairs of alleles (DD and Dd) has equal chance of being expressed i e, the probability that the mouse has the alleles DD is equal to the probability that it has the alleles Dd. Both pairs each has 0.5 chance of occuring.

Answer:

Explanation:

A Dominant Allele is an Allele that express itself.

DD- this represent a dominant homozygous allele

Dd- represent a dominant heterozygous allele

When an individual with DD is crossed with Dd we will have DD,Dd,DD,Dd

Phenotypic ratio is 2:2

i.e homozgous dominant crosses with heterozygous dominant

which means both DD and Dd have 50% chance of occuring in the genotype and the probabality is the same.

Note that in the phenotype of an individual with homozygous dominant (DD) is the same phenotype with heterozygous dominant(Dd)

Why does the moon have a greater influence on Earth's Tides than the sun does

Answers

Answer:

Because ocean tides are the effect of ocean water responding to a gravitational gradient, the moon plays a larger role in creating tides than does the sun. But the sun's gravitational gradient across the earth is significant and it does contribute to tides as well.

Explanation:

Consider the steady ultafiltration of a solute from the capillary across the glomerular endothelial cells into the urinary filtrate in the kidneys. Model the endothelial cells as an infinite membrane of thickness tEC. Assume a well-mixed capillary with concentration CC and a well-mixed filtrate at CF. With a diffusion constant of DEC in the endothelial cell compartment, what is concentration profile across the endothelial cells

Answers

Answer:

DEC = CC + CF

Explanation:

It should be understood that, the concentration profile across the endothelial cells will base on the diffusion rate of the filtrate .

Depending on the organism, the number of____in a cell may change.

Answers

Answer:

chromosomes

Explanation:

Which characteristics do temperate Marine and temperate Continental climates have in common

Answers

Options are not provided in the question. The complete question is:

Which characteristics do temperate marine and temperate continental climates have in common? Check all that apply.

A.mild winters

B. hot summers

C. many tall trees

D. moderate amount of precipitation

E. two seasons with temperature differences

Answer:

D. moderate amount of precipitation

E. two seasons with temperature differences

Explanation:

The temperate marine climate is generally the climate of west coasts in higher middle latitudes of continents.

Temperate continental climates also known as microthermal climates are located away from the oceans.

Though the location of both the climates is different but some of the characteristics are similar that include are modertae amount of precipitation and two seasons with temperature differences.

Both the climates have moderate rainfall across the year ( modertae amount of precipitation) and mild to warm summers and cool to cold winters.

Hence, the correct option is D and E.

Answer:

Answer is D on egde!!

Explanation:

Which of these is found within all cells?
Organ systems
Organs
Tissues
Molecules

Answers

Answer:

tissues

Explanation:

cells make tissues and tissues make organs

Why do fungi need to live in moist areas

Answers

Answer:

Search Results

Featured snippet from the web

Fungi help catabolism of complex organic matter into simple available inorganic forms. In other words they breakdown organic matter to obtain energy. This process of decomposition requires aerobic ambient and moisture therefore they are mostly found in moist habitats rich in detritus.

Explanation:

Fungi help catabolism of complex organic matter into simple available inorganic forms. In other words they breakdown organic matter to obtain energy. This process of decomposition requires aerobic ambient and moisture therefore they are mostly found in moist habitats rich in detritus.

How much exercise is recommended for children?


A 60 minutes or more of moderate to vigorous exercise every day

B 45-60 minutes of moderate to vigorous exercise every other day

C 10-20 minutes of vigorous exercise every day

D20-30 minutes of moderate to vigorous exercise every day

Answers

I think it’s D 20-30 minutes everyday

Answer:

A. 60 minutes or more of moderate to vigorous exercise every day

Which of the following relationships may present harm to one of the organisms involved?

I. Commensalism
II. Parasitism
III. Predation
IV. Mutualism

(A) I and II only
(B) I and IV only
(C) II and III only
(D) III and IV only​

Answers

Answer:

C

Explanation:

Predator-Prey relationship

Break down the codeTCCGCGCAGAGCTAG using DNA, mRNA, tRNA, Amino Acid

Answers

Answer:

TCCGCGCAGAGCTAG  : CODE          DNA= A=T  G=C

AGGCGCGTCTCGATC : DNA             mRNA=A=U C=G

UCCGCGCAGAGCUAG :mRNA          

AGG CGC GUC UCG AUC :tRNA

AMINO ACIDS = AGG  ---->Arg (R)

                            CGC ----->Arg (R)

                            GUC ------>Val (V)

                           UCG------> Ser (S)

                           AUC------->IIe (I)

50 point question here answer it please

Answers

Answer:

the first one

Explanation:

the partials in a liquid are closer together then a plasma  

Answer:

number 1

Explanation:it make since

What type of acid is currently of principal concern when dealing with acid rain?

Answers

Answer: Sulfur dioxide (SO2) and nitrogen oxides (NOx) released into the air by fossil-fuel power plants, vehicles and oil refineries are the biggest cause of acid rain today, according to the EPA. Two thirds of sulfur dioxide and one fourth of nitrogen oxide found in the atmosphere come from electric power generators

hope this helps

At what ages are teeth the most accurate indicators of age of an unknown skelton? Justify your answer with an explanation.

(Forensics)

Answers

Answer:

The tibia completes growth at about age 16 or 17 in girls, and 18 or 19 in boys. For toddlers to teenagers up to age 21, teeth are the most accurate age indicators

Explanation:

A DNA molecule is made up of building blocks known as nucleotides. Each nucleotide consists of deoxyribose, a phosphate group, and one of the chemical bases. The nucleotides join together to form a
, which form the backbone of a DNA strand.

Answers

Answer:

polynucleotide

Explanation:

according to edmentum notes, "The nucleotides join together to form a polynucleotide. Polynucleotides form the backbone of a DNA strand.'

Nucleotides are the building units of the DNA or RNA molecule. DNA is composed of deoxyribose, a phosphate group, and one of the chemical bases that make up each nucleotide.

What is a nucleotide?

It is a monomer of DNA or RNA. It is composed of a sugar (deoxyribose in DNA ribose in RNA), a phosphate group, and one of the chemical bases that make up each nucleotide.

The backbone of DNA is formed by which components?

It is formed of sugar and phosphate only.

To learn more about DNA, RNA, and nucleotide here,

https://brainly.com/question/12940443

#SPJ2

Unscramble the word - oicnoecm mptcia earth science please

Answers

I want to say

Economic impact (?)

Answer:

The answer is Economic impact.

DPIP was used in the photosynthesis lab to measure the

-Light dependent reactions

-Production of O2

-Light Independent reaction (a.k.a. Calvin cycle)

-Production of CO2

Answers

Answer:

Light dependent reactions

Explanation:

DPIP stands for Dichlorophenolindophenol. It is a chemical compound that is used as a redox dye.

DCPIP is blue when it is oxidized DCPIP is colorless when it is reduced.

DCPIP measures the rate of photosynthesis. The redox dye is decolorized by chemical reduction when it is exposed to light in the process of photosynthesis.

DPIP was used in the photosynthesis lab to measure the light dependent reactions.

The process through which humans breed other animals and plants for particular traits:
A) artificial selection
B) genetic engineering
C) genes
D) selective breeding
E) traits

Answers

Answer:

A) artificial selection

Fertilizer runoff causes an increase in the dissolved nutrients of the ecosystem shown in the food web below. This causes the number of phytoplankton to double.


How will this most likely affect the other species in this ecosystem?
A.
The shrimp population will increase which will cause an increase in the squid population.
B.
The shrimp population will decrease which will cause an increase in the squid population.
C.
The shrimp population will decrease which will cause an increase in the sperm whale population.
D.
The shrimp population will increase which will cause a decrease in the sperm whale population.

Answers

Answer:

I believe the answer is A because if shrimp eat phytoplankton, and squid eat shrimp this should work. I am not positive but I hope this helps.

how does blood volume affect blood pressure

Answers

Answer:

Changes in blood volume affect arterial pressure by changing cardiac output. An increase in blood volume increases central venous pressure. This increases right atrial pressure, right ventricular end-diastolic pressure and volume.

Explanation:

Darwin would probably say that Rudolph the Red Nosed Reindeer was the first reindeer to have a red
nose as a result of:

Answers

Answer:

genetic mutation

Explanation:

the first of any trait is due to some form of mutation, whether it may be in the DNA or chromosomes as a whole.

Wildfires are _____.

Answers

Answer:

C

Explanation:

I think it is C I hope this helps!

which of the following describes an interaction where an organism of one species benefits and an organisms of a different species is not significantly affected? ​

Answers

Commensalism is an association between two different species where one species enjoys a benefit and the other is not significantly affected. Probably the best example of commensalism is the relationship between cattle egrets and large herbivores

According to the information in the passage, before purchasing bird food for a bird feeder a person should
es )))
A)
plant trees and shrubs in the yard.
B)
purchase a birdbath and a birdhouse.
know what kinds of birds are common to the area.
D
create a bird-friendly environment in the backyard.​

Answers

Answer:

1 is C) know what kinds of birds are common to the area.

2 is D)    main idea and details

Explanation:

I had it on a test hope this helps

Answer: C

Explanation: Know what kinds of birds are common to the area

In Guinea pigs, short hair (S) is dominant over long hair (s), and black coat color (B) is dominant over
albino (b). Both genes assort independently. A female of a true breeding line with a black coat and long
hair is mated with a short haired albino male (also from a true breeding line). (a) What are the
phenotypes of the F1 generation? Explain. (b) If F1 is mated, which percentage of the offspring will be
homozygous for both characters? Give all genotypes and phenotypes of these homozygotes.​

Answers

Answer:

Explanation:

Short hair (S) is dominant over long hair (s), and black coat color (B) is dominant over albino (b).

A female of a true breeding line with a black coat and long  hair is mated with a short haired albino male (also from a true breeding line)

parents genotype      BBss  x    SSbb

gametes                       Bs     x    Sb

F1 generation geenotype    BbSs

Phenotype- They are all with black coat and short hair

Mating of F1   BbSs  x  BbSs

   Percentage of offspring homozygous for both characters:

  Bb  x   Bb           Ss   x   Ss

 BB Bb Bb bb     SS  Ss Ss ss

 1/4             1/4         1/4       1/4

1/4*1/4 = 1/16 = 0.0625 = 6% for each homozygous characters (BBSS-6% and bbss-6%)

The genotypes of the homozygotes are BBSS and bbss

The phenotype of BBSS is black coat with long hair

The phenotype of bbss is an albino with short hair



1. Which plant traps bugs in its stem and forces them to walk forward?

Answers

Explanation:

The active trap in the Venus Flytrap ( dionaea muscipula )

In which environment would primary succession take place? Select 2 options.
an abandoned field
a cooling lava flow
a valley under a glacier
an unused farm
a deserted mine

Answers

Answer:the answer is B and C since there is no soil or life

Explanation: explanation is up there

Answer:

B and C

Explanation: I got the answer right on my test

Which of the following statements regarding selenium/selenoproteins is incorrect?

a. They are proven protection against colon cancer.
b. The amount of selenium in foods depends upon the soil where the plants were grown and animals grazed.
c. Selenium functions as an antioxidant.
d. Selenium plays an important role in the regulation of thyroid hormones.

Answers

Answer:

The correct answer is: A. They are proven protection against colon cancer.

Explanation:

Selenium is a mineral that can be incorporated into our bodies in small amounts when we consume certain foods, such as whole grain and dairy products. The amount of selenium in these products depends on the soil where the plants and animals were.

Selenium plays an important role as an antioxidant, which can lower the risk of developing several types of cancer. However, this doesn't mean that its consumption can prevent colon cancer, and the studies that had been done to prove its effectivity in these regards have been inconclusive.

Besides functioning as an antioxidant, selenium also is very important for the regulation of the thyroid hormones, which play an important part in metabolism.

The protein that contains selenocysteine amino acid remnants is called selenoproteins. They are found in the endoplasmic reticulum of the cells.

The incorrect statement is:

Option a. They are proven protection against colon cancer.

The statement can be explained as:

Selenium is a mineral that gets incorporated into our body through foods, dairy and whole grains. The amount of selenium depends on its amount and presence in the soil.

Selenoproteins are good antioxidants that can lower the risks of cancers. But its consumption does not provide complete protection against cancers.

It also regulates the thyroid hormone and plays a vital role in the regulation of metabolism.

Thus, they have not proven medication for colon cancer.

To learn more about selenoproteins follow the link:

https://brainly.com/question/1696005

What happens during interphase that allows the two resulting cells to be the same as the
original cell?

Answers

Answer:

During mitosis, a eukaryotic cell undergoes a carefully coordinated nuclear division that results in the formation of two genetically identical daughter cells. ... Then, at a critical point during interphase (called the S phase), the cell duplicates its chromosomes and ensures its systems are ready for cell division.


Check all the boxes where the vocabulary word correctly matches its
science definition?
Equilibrium: a system where forces are in balance
O
Climax community: the end of a succession resulting in a stabilized community
o
Succession: the act of winning in life
Primary Succession: colonization of an area that has not been previously occupied by
a community, e.g. newly exposed rock
Pioneer Species: the first organisms to live on rocky surfaces, e.g. lichens, moss,
algae, and fungi
Secondary Succession: colonization following a major disturbance, such as a fire or a
flood

Answers

Answer:

Climax community, primary succession, pioneer species, secondary succession.

Explanation:

Equilibrium with regards to succession occurs as "a state of dynamic equilibrium in a community of organisms in which genetic, species and ecosystem diversity remain relatively stable, but this factors are subject to gradual changes through natural succession."

Succession: the process by which the structure of a biological community evolves over time.

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