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Physiology Final
| Question | Answer |
|---|---|
| The neurotransmitter(s) that inhibit(s) the conduction of pain impulses is(are): | enkephalins. |
| The active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the | sodium-potassium pump. |
| The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second. | 130 |
| Cerebrospinal fluid is formed by filtration of blood in the: | choroid plexuses. |
| Blood vessels in both digestive organs and skeletal muscles are dilated by sympathetic stimulation. | True |
| The parasympathetic and sympathetic divisions always act with a cooperative influence, and through summation of the impulses, the effect can be increased. | False |
| Which of the following is a description of the principle of autonomic antagonism as it relates to the autonomic nervous system? | If sympathetic impulses tend to stimulate an effector, parasympathetic impulses tend to inhibit it. |
| The two-point discrimination test can be used to measure: | the sensitivity of the skin in various parts of the body. |
| Which of the following is a function of glucagon? | Tends to increase blood glucose concentrations |
| The chemoreceptors in the carotid bodies are particularly sensitive to: | hypoxia. |
| The heart begins beating in the fetus at about what stage of development? | After about 4 weeks |
| The body’s defense mechanisms can be organized into one of two major categories of immune mechanisms; these are | innate and adaptive immunity. |
| Which of the following is a powerful poison that acts directly on any cell and quickly kills it? | lymphotoxin |
| Which of the following is not a true statement? | When the diaphragm contracts, it pulls the floor of the thoracic cavity downward. |
| External respiration can be defined as: | the exchange of gases between the lung and the blood capillaries in the lung & pulmonary ventalation |
| Which of the following is not true of enzymes? | They change chemically and are in the end products of the reaction. |
| The hormone thought to be a messenger causing release of digestive enzymes from the intestinal mucosa is: | vasoactive intestinal peptide. |
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MAYRA.GAITAN
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