Answer the following statements true (T) or false (F)
1. Thermoregulatory responses to increased heat are mediated by the sympathetic nervous division.
2. Most disorders of the autonomic nervous system reflect abnormalities of smooth muscle control.
3. Alpha-adrenergic effects are usually stimulatory and mediatory.
4. The adrenal medulla is considered a "misplaced" sympathetic ganglion by some.
5. Acetylcholine is the substance released by the axonal endings of the somatic efferent fibers and by the parasympathetic nerve fiber endings.
1. TRUE
2. TRUE
3. TRUE
4. TRUE
5. TRUE
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Local arteriolar myogenic and chemical mechanisms that keep tissue blood flow fairly constant (despite rather wide deviations in mean arterial driving pressure) is termed:
a. hemo-control b. autoregulation c. hemo-stimulation d. pararegulation e. sympathetic balance
Two large venous sinuses, the sagittal sinuses, lie within a dural fold called the
A) tentorium cerebelli. B) falx cerebelli. C) lateral aperture. D) falx cerebri. E) arachnoid granulations.
In the brain, the ________ is the integration and command center for autonomic functions.
A. brainstem B. hypothalamus C. spinal cord D. medulla E. cerebral cortex
The presence of cholesterol molecules in plasma membranes is to
A. stabilize the phospholipids bilayer. B. create a mosaic pattern. C. allow the buildup of fats. D. change the chemical nature of the membrane.