Why is positive feedback helpful in blood clotting but unsuitable for regulating body temperature?
What will be an ideal response?
Positive feedback is useful in processes that, once begun, must move quickly to completion — for example, blood clotting. It is harmful in situations where stable conditions must be maintained because it tends to exaggerate any departure from the desired condition. Thus, positive feedback in the regulation of body temperature would cause a slight fever to spiral out of control, with fatal results.
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1. maintaining a concentration gradient across a membrane 2. working on a dock, loading and unloading boxes into trucks all day 3. wound healing, recovering from surgery 4. enlarging one's muscles through body-building exercises 5. bringing glucose molecules inside brain cells so one can think 6. a thoroughbred horse, or greyhound dog, running around the track A. chemical work B. transport work C. mechanical work
If neurotransmitter from Y causes the membrane potential of the postsynaptic cell to decrease slightly, then
a. the synapse is excitatory b. the postsynaptic membrane's potential will be farther away from threshold c. the postsynaptic membrane causes an EPSP on the presynaptic membrane d. neurotransmitter from Y causes an IPSP on the presynaptic membrane e. both a and c are correct
The anatomical term that describes a person lying face up is _______.
a. prone (lying face down) b. ventral c. supine d. operational
Calcium-induced calcium release occurs when
A. calcium from the sarcoplasmic reticulum stimulates the movement of calcium into the cell through the plasma membrane. B. calcium is released from both the sarcoplasmic reticulum and the cardiac muscle cell. C. the eflux of calcium from the cell results in depolarization. D. calcium entering through the plasma membrane stimulates release of calcium from the sarcoplasmic reticulum.