Saltatory conduction
a. occurs in unmyelinated nerve fibers.
b. is slower than conduction by local current flow because the myelin acts as an insulator to slow the impulse down.
c. involves the impulse jumping from one node of Ranvier to the adjacent node.
d. refers to the action potential spreading from one Schwann cell to the adjacent Schwann cell.
e. more than one of these answers.
C
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Answer the following statements true (T) or false (F)
1. Research has indicated that prostaglandins work by increasing the number of hormone receptors produced by a cell. 2. Another name for the posterior pituitary gland is the adenohypophysis. 3. One of the main differences between the anterior and posterior pituitary glands is that one is made of glandular tissue and one is made of nerve tissue. 4. The pituitary gland sits in the “Turkish saddle.” 5. Many of the posterior pituitary hormones are tropic hormones.
What does a closed venous valve prevent?
a. escape of blood from the vessel b. muscle contraction c. hypertension d. backflow of lymph e. backflow of blood
The short connection between a spinal nerve and a sympathetic chain ganglion through which preganglionic neurons pass is called the
A. white ramus communicans. B. gray ramus communicans. C. splanchnic nerve. D. terminal ganglia. E. pink ramus communicans.
Which vertebra is called the "vertebra prominens"?
A. T1 B. C2 C. C7 D. C1