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1 | |
Feedforward regulation differs from feed-back regulation in the following way(s): |
| | A) | The former is stimulatory while the latter is inhibitory. |
| | B) | The former allows the CNS to anticipate the need for changes in physiological setpoints, whereas the latter does not. |
| | C) | Only the latter is involved in homeostatic regulation. |
| | D) | A and B |
| | E) | A and C |
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2 | |
Shivering in response to a cold draft is an example of |
| | A) | a homeostatic mechanism. |
| | B) | negative feedback. |
| | C) | a physiological reflex. |
| | D) | A and B. |
| | E) | A, B and C. |
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3 | |
Homeostasis |
| | A) | depends upon control systems that use primarily positive feedback. |
| | B) | involves adjusting to the external environment in a process called acclimatization. |
| | C) | depends upon the interaction of receptors, integrating centers, and effectors. |
| | D) | A and B |
| | E) | is described by none of the above. |
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4 | |
The efferent pathway of a reflex arc |
| | A) | is so named because it carries information to the integrating center. |
| | B) | can be neural. |
| | C) | can be hormonal. |
| | D) | A and B. |
| | E) | B and C |
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5 | |
Which one of the following is the correct sequence for a regulatory reflex arc? |
| | A) | Stimulus, effector, efferent pathway, integrating center, afferent pathway, receptor. |
| | B) | Stimulus, receptor, efferent pathway, integrating center, afferent pathway, effector. |
| | C) | Stimulus, receptor, afferent pathway, integrating center, efferent pathway, effector. |
| | D) | Stimulus, effector, afferent pathway, integrating center, efferent pathway, receptor. |
| | E) | Effector, efferent pathway, integrating center, afferent pathway, receptor, stimulus. |
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6 | |
Free-running biological rhythms exist in the absence of environmental time cues. |
| | A) | True |
| | B) | False |
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7 | |
When loss of a substance from the body exceeds gain, the body is said to be in positive balance for that substance. |
| | A) | True |
| | B) | False |
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8 | |
Which of the following statements about apoptosis is incorrect? |
| | A) | Apoptosis describes the death of a cell due to injury |
| | B) | Apoptosis occurs by controlled autodigestion of the cell contents |
| | C) | Apoptosis can regulate the number of cells in a tissue or organ |
| | D) | Apoptosis eliminates undesirable cells |
| | E) | Apoptosis is a type of intrinsic cell suicide program |
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