Describe the tissue stages of development. Include information on the embryonic germ layers and what they give rise to.

Answers

Answer 1

Answer:

Gastrulation takes place after cleavage and the formation of the blastula and the primitive streak. It is followed by organogenesis, when individual organs develop within the newly-formed germ layers. Each layer gives rise to specific tissues and organs in the developing embryo.Cells in each germ layer differentiate into tissues and embryonic organs. The ectoderm gives rise to the nervous system and the epidermis, among other tissues. The mesoderm gives rise to the muscle cells and connective tissue in the body. The endoderm gives rise to the gut and many internal organs.


Related Questions

If the stomata remain closed due to water loss, what happens to the concentration of CO2 and O2 in the leaf

Answers

Answer:

Fixation of oxygen occur instead of carbondioxide.

Explanation:

If the stomata remain closed due to water loss, the concentration of carbondioxide decreases and oxygen increases in the leaf because of the fixation of oxygen instead of carbondioxide by rubisco. The plant takes carbondioxide from the atmosphere when the stomata is open so when the stomata is closed there is no other way for getting carbondioxide into the leave so the oxygen is now being fixed by our rubisco enzyme to that five-carbon compound instead of carbon dioxide.

Which phase of the cell cycle is the least common process of mitosis and what could be the reason?

Answers

Answer:

In anaphase, the shortest stage of mitosis, the sister chromatids break apart, and the chromosomes begin moving to opposite ends of the cell. By the end of anaphase, the 2 halves of the cell have an equivalent collection of chromosomes. In telophase, 2 daughter nuclei form. The nuclear envelope beings to reappear.

some_____ function as signals that regulate the cell cycle

Answers

Answer:

Cell growth

Explanation:

bcoz it help for growthing

PNS axons are vulnerable to cuts, crushing injuries, and other types of trauma. However, a damaged ____________ can regenerate if the ____________ remains intact and a critical amount of ____________ remains. The success of peripheral nervous system axon regeneration depends upon two primary factors: (1) the amount of ____________ and (2) the ____________ between the site of the damaged axon and the ____________ . The possibility of repair is ____________ with an increase in either of these two factors. Neurolemmocytes play an active role in regeneration

Answers

Answer:

The correct answer is - damaged, effector organ, neurilemma, damage, distance, cell body, decreased.

Explanation:

PNS axons are prone to cuts, and other types of injuries. A damaged axon can regenerate if the effector organ remains intact and a critical amount of neurilemma is found.

The degree of success of these axons regeneration depends upon factors that are (1) the amount of damage, and (2) the distance between the site of the damaged axon and the cell body it innervates The possibility of repair is reduced with an increase in either of these two factors. Neurolemmocytes play an active role in regeneration

a) explain covalent bond and hydrogen bond with an example of each (4marks)
b)state three(s) importance of surface tension and example( 6marks)​

Answers

Answer:

Covalent bond is a primary chemical bond formed by the sharing of electron pairs. Covalent bonds are strong bonds with greater bond energy. Hydrogen bond is a weak electrostatic attraction between the hydrogen and an electronegative atom

A certain animal species has either curly tails (C) or straight tails (c) and either hazel eyes (H) or blue eyes ( h). What are the possible genotypes of an animal with curly tails and blue eyes

Answers

Answer:

CChh

Cchh

Explanation:

Cc or CC can be a genotype for curly tails because both have a dominant allele for curly tails

hh can be a genotype for blue eyes because there are two recessive alleles for blue eyes that are present

Mode of action of aldehydes and Quaternary ammonium compounds is

Answers

Answer:

Aldehydes have antibacterial, antifungal, antiviral and sporicidal activity. These are helpful to destroy the spores of Bacillus subtilis and Clostridium sporogenes. Glutaraldehyde and formaldehyde are commonly used aldehydes in disinfectants.

Quaternary ammonium compounds work by denaturing the proteins of the bacterial or fungal cell, affecting the metabolic reactions of the cell and causing vital substances to leak out of the cell, causing death.

People's movements between places is called _____________________.

Answers

Answer:

spacial interaction I think. I hope this helps!

Answer:

people's movements between places is called human migration .

Which of these organelles prepares proteins to be fully functional?

A. Rough endoplasmic reticulum

B. Large vacuoles

C. Smooth endoplasmic reticulum

D. Chloroplasts

Answers

Rough endoplasmic reticulum

Answer:

Rough endoplasmic reticulum is among the organelles that are found in eukaryotic cells. The reason as to why it is called rough is because it has ribosomes attached to its surface. Its main function is to produce proteins.

Explanation:

Write down Gibbs energy equation and indicate which one is change in enthalpy​

Answers

Its symbol is ΔfG˚. All elements in their standard states (diatomic oxygen gas, graphite, etc.) have standard Gibbs free energy change of formation equal to zero, as there is no change involved. ΔfG = ΔfG˚ + RT ln Qf, where Qf is the reaction quotient.

What is limiting factor

Answers

Answer:

limiting factors are often referred as a lack of a particular resource .

What causes an ionic bond?
A. Two ions share electrons.
B. A positive ion is attracted to a negative ion.
C. A positive ion is attracted to a positive ion.
D. Two atoms share electrons.

Answers

Answer:

B

Explanation:

An ionic bond is formed when an atom usually metallic, loses an electron to become positively charged and another atom usually non-metallic, gains such electron lost and becomes negatively charged..

The most direct method by which an ion or molecule can move across a cell membrane is by ____________.A. using an integral protein.B. a sodium-potassium pump.C. simple diffusion. D. active transport.E. osmosis.

Answers

Answer:

C. Simple diffusion

Explanation:

Simple diffusion from a high to low concentration is the most direct method that ions or molecules can move across a cell membrane.

Through this method, no proteins are required for transport, and no energy is used.

The ion or molecule being transported directly moves across the cell membrane, without any other factors involved.

So, the correct answer is C. Simple diffusion

which photo synthetic process can occur at night?
A.the reaction at photosystem 1
B.the formation of NADH
C.the calvin cycle
D.the reaction at photosystem 2

Answers

Its most likely D because it’s more reasonable

Describe the relationship between the surface area and the volume of a cell. Analyze the data and explain why cells are often flattened instead of cube-shaped.

Answers

Answer:

Inverse relation.

Explanation:

There is an inverse relationship between the surface area and the volume of a cell because one increases the other decreases. When a cell grows bigger in size, its internal volume enlarges and the cell membrane start expanding. Unfortunately, the volume increases more rapidly than the surface area of the cell. So the surface area available to pass materials to a unit volume of the cell steadily decreases. Cells are often flattened instead of cube-shaped because the surface area increases. Due to surface area increases, more materials to be absorbed through the cell membrane at a greater rate than that of a cell with smaller surface area.

What two hormones rise in response to general stress?

Answers

Answer:

Adrenaline and Cortisol

Explanation:

Adrenaline increases your heart rate, elevates your blood pressure and boosts energy supplies. Cortisol, the primary stress hormone, increases sugars (glucose) in the bloodstream, enhances your brain's use of glucose and increases the availability of substances that repair tissues.

Suppose beak size currently ranges from 6-10mm. If directional selection favors larger beaks (up to a max of 15mm), which statement is true?

Answers

source of variation needs to create that size

state 2 function of the kidney

Answers

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HERE IS UR ANSWER

_____________________

The kidneys are powerful chemical factories that perform the following functions:

remove waste products from the body.remove drugs from the body.balance the body's fluids.release hormones that regulate blood pressure.produce an active form of vitamin D that promotes strong, healthy bones.
It removes waste products from the body. And also removes drugs from the body

What happens to predator populations when prey populations are scarce? Why?

Answers

When prey is abundant, predator populations increase because more young are able to survive. More predators kill more prey, which, along with food scarcity, decreases the population. When prey becomes more scarce, the predator population declines until prey is again more abundant. Therefore, the two balance each other.

Calculate the number of neutrons in atoms of the isotope 3919K
With working out

Answers

Answer:

20 neutrons

Explanation:

In the atom of an element, there exists three subatomic particles namely; proton, neutron and electron etc. The sum of the number of neutrons and number of protons (a.k.a atomic number) in an atom makes up the mass number.

In this question, an element was given as follows: 39- 19 K meaning that the mass number is 39 but the atomic number is 19.

Hence,

no of. neutrons = mass no. - atomic no.

39 - 19 = 20 neutrons.

Explain the role of cellular respiration in a cell.

Answers

Answer:

Every cell performs a type of cellular respiration as it is required to produce energy. The point of cellular respiration is to turn high-energy molecules, know as glucose, into ATP, a form of usable energy. There are two types of respiration, aerobic and anaerobic. Aerobic goes through 3 stages and produces the most ATP by using oxygen and releasing carbon dioxide. Anaerobic does the same job but only uses one stage and produces much less ATP. This process gives the cell energy and continues the carbon cycle.

__________ always pairs with _________.

Answers

Answer:

Adenine and Thymine, Cytosine and Guanine?

Explanation:

Answer:

I  always pairs with my best friend

Explanation:

In general, men show _____ than women do. a. less facial expression b. more facial expression c. less envy or anger d. more envy or anger

Answers

Answer:

more envy and anger

Explanation: they cant control themselves lol.

Which critter trait is affected by an environmental factor, such as light, temperature, or
diet? Explain.

Answers

Answer:

Tallness.

Explanation:

Tallness is the critter trait that is affected by an environmental factor, such as light, temperature, or  diet because the organism remains short if they are not getting food properly as well as temperature. Food provides essential nutrients that contribute in the growth of organism. Suitable temperature of the body allows the different functions in the body to be done which directly affects the growth of the body and the organism becomes taller.

Identify the molecule that is not a compound

Answers

Answer:

dear, your question seems to be incomplete.......plz ask it again

This could be Hydrogen gas as it is a molecule but is not a compound as it is only made up of one element!

The islets of Langerhans are surrounded by

A-exocrine cells that produce digestive fluid.

B-endocrine cells that produce digestive fluid.

C- exocrine cells that produce glycogen

D-B and C

PLEASE HELP ME ITS REALLY URGENT CAUSE I HAVE EXAMS TOMORROW!!!

Answers

Answer:

A-exocrine cells that produce digestive fluid.

Explanation:

The pancreas is composed of both exocrine cells (capable of producing digestive enzymes) and endocrine cells (involved in the production of hormones that control glucose homeostasis). The islets of Langerhans are clusters or 'islands' of pancreatic endocrine cells, which consist of α-cells that produce glucagon, β-cells that secrete insulin and δ-cells that produce somatostatin. These islets are surrounded by: 1-exocrine cells called 'acini' that produce digestive enzymes such as chymotrypsin, trypsinogen, lipase, and elastase; and 2-bile ductules, which are tubes that carry bile from the liver and the gallbladder through the pancreas.

Describes vitamin D levels and problems

Answers

Answer:

Vitamin D is essential for strong bones,because it helps the body use calcium from the diet.

It’s important for normal growth and development of teeth and bones. It can help resist against certain diseases. Some problems if you take to much vitamin D is that you will get weakness, fatigue, sleepiness, headache, loss of appetite, dry mouth, metallic taste, nausea, vomiting, and others.

Egg fertilization happens in the?

Answers

fertilization takes place in the fallopian tube

Look at the diagram below.
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Which best describes the structure labeled X in the diagram?

Answers

Answer:

C

Explanation:

Its transfer element through it channel

In which of the scientific classifications are all the
animals grouped

Answers

The lion belongs to the following groups: Kingdom Animalia (includes all animals) Phylum Chordata (includes all vertebrate animals, as well as some other more primitive ones) Class Mammalia (includes all mammals)
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