Question

1. preganglionic fibers of the autonomic efferent pathway are ___ and secrete ___.

a) myelinated; norepinephrine (ne) b) unmyelinated; norepinephrine (ne)
c) myelinated; acetylcholine (ach) d) unmyelinated; acetylcholine (ach)

1. upper motor neurons synapse with lower motor neurons in the _____.

a) posterior root ganglion
b) anterior horn of gray matter
c) anterior column of white matter
d) posterior column of white matter
e) posterior horn of gray matter

1. the lateral horns of the spinal cord contain _____.

a) myelinated axons of motor neurons.
b) myelinated axons of sensory neurons.
c) myelinated axons of sensory and motor neurons.
d) cell bodies of sympathetic motor neurons.
e) cell bodies of somatic sensory neurons.

1. the parasympathetic division arises from the _____ regions of the spinal cord.

a) brain, thoracic, and lumbar b) brain and sacral
c) brain, cervical, lumbar, and coccygeal d) sacral and lumbar

1. the adrenal medulla secretes mostly _____.

a) epinephrine
b) dopamine
c) acetylcholine (ach)
d) endorphins
e) gaba

1. which of the following functions would most likely be controlled by the representational hemisphere of the cerebrum, i.e. the

ight side of the brain\?
a) balancing your checkbook b) diagnosing a patients disease
c) painting a picture d) answering this question

1. motor commands are carried by _____ from the brain through the spinal cord.

a) descending tracts b) spinal nerves c) ascending tracts d) cranial nerves

1. which of the following is not a feature of the sympathetic division of the ans?

a) it has long preganglionic fibers.
b) its chain ganglia are next to the spinal column.
c) it has long postganglionic fibers.
d) it has a relative widespread effect, i.e. exhibits mass activation.

1. where are the cardiac, vasomotor, and respiratory centers found?

a) midbrain
b) spinal cord
c) diencephalon
d) pons
e) medulla oblongata

Explanation:

1. Preganglionic fibers of the autonomic efferent pathway are myelinated and secrete acetylcholine (ACh).
2. Upper motor neurons synapse with lower motor neurons in the anterior horn of gray matter.
3. The lateral horns of the spinal cord contain cell bodies of sympathetic motor neurons.
4. The parasympathetic division arises from the brain and sacral regions of the spinal cord.
5. The adrenal medulla secretes mostly epinephrine.
6. Painting a picture is most likely controlled by the representational hemisphere (right side) of the cerebrum.
7. Motor commands are carried by descending tracts from the brain through the spinal cord.
8. The sympathetic division of the ANS does not have long preganglionic fibers.
9. The cardiac, vasomotor, and respiratory centers are found in the medulla oblongata.

Answer:

1. C. myelinated; acetylcholine (ACh)
2. B. anterior horn of gray matter
3. E. cell bodies of sympathetic motor neurons
4. B. brain and sacral
5. A. epinephrine
6. C. Painting a picture
7. A. descending tracts
8. A. It has long preganglionic fibers
9. E. Medulla oblongata