The airborne odor particles must first dissolve in the mucus before coming in contact with the olfactory sensory neuron's dendrites which then send the signal up their axon and onto the olfactory bulb of the brain.
In the nasal cavity, air is filtered and conditioned. The mucus layer, which protects the epithelial surface of the nasal cavity, catches larger particles and bacteria before they can reach the olfactory neurons. The odorants in the air that do pass through the mucus layer interact with receptors on the dendrites of the olfactory sensory neurons. These receptors are located in the olfactory cilia, which are hair-like projections on the dendrites. The olfactory cilia contain odorant receptor proteins that bind to specific odorant molecules, and when they do, a signal is sent through the dendrite and into the olfactory bulb of the brain.
The dendrites of the olfactory sensory neurons contain receptor proteins that bind to specific odorant molecules. When an odorant molecule binds to its receptor, it causes a change in the ion channels that are embedded in the dendrite membrane. This change in the ion channels leads to an electrical signal, which travels along the dendrite and into the axon. The axon is a long, thin fiber that carries the electrical signal away from the dendrite and toward the olfactory bulb of the brain. The axons of olfactory sensory neurons are unique in that they do not have a myelin sheath, which is a fatty coating that insulates most other neurons. Instead, they are coated in a thin layer of mucus, which allows odorant molecules to dissolve and interact with the dendrites.
This mucus coating also helps to protect the axon from damage as it travels through the nasal cavity and toward the brain. Therefore, the airborne odor particles must first dissolve in the mucus before coming in contact with the olfactory sensory neuron's dendrites which then send the signal up their axon and onto the olfactory bulb of the brain.
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How did you make the distinction between the two types of test?.
The two types of test are objective test and subjective test. The objective test is a type of test that has a definite right or wrong answer. Objective test items, including true-false, multiple-choice, and matching, assess recall or recognition, discrimination, or application of principles.
On the other hand, subjective test items require the examinee to construct a response from scratch instead of choosing one from a predetermined set of responses. Essay questions and short-answer questions are examples of subjective test items. Objective and subjective tests are two different types of tests. Objective tests, as the name suggests, are tests that have a definite right or wrong answer.
The items on an objective test, such as true-false, multiple-choice, and matching items, test recall, discrimination, or the application of principles. Since each question on an objective test has a precise answer, grading is simple and straightforward. Grading an objective test does not require the use of the examiner's judgment or interpretation. The subjective test, on the other hand, is a type of test in which the examinee must construct a response from scratch rather than select one from a predetermined set of responses. This includes essay questions and short-answer questions, among other things.
Since the examinee is creating a response rather than selecting one from a predetermined list, subjective tests measure creative thinking and problem-solving skills rather than mere recall or recognition. Since there is no one correct answer, grading subjective tests necessitates the use of the examiner's judgment or interpretation.
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