Which of the following is not a reason that somatic reflexes act faster than visceral reflexes?
A) Some of the neurons in the effector pathway in the visceral reflex arc are unmyelinated.
B) The effector pathway in the visceral reflex arc involves more chemical synapses.
C) The effector pathway in the somatic reflex arc is myelinated.
D) The effector organs in the somatic reflex are closer to the spinal cord.
E) The effector pathway in the visceral reflex arc involves more neurons.
D
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"Goose bumps" are caused by
a) action of arrector pili muscles. b) secretions from the sudoriferous glands. c) contraction of dermal papillae. d) stimulation of hair root plexus. e) secretions from the sebaceous gland.
The ________ vein is formed by the fusion of the greater saphenous vein, femoral vein, and deep femoral vein
A) internal iliac B) external iliac C) common iliac D) inferior vena cava E) azygos
Which is not characteristic of sympathetic pathways?
a. Fibers originate from the thoracic and lumbar levels b. Preganglionic fibers release norepinephrine c. Some postganglionic fibers release ACh d. Short preganglionic fibers e. Most preganglionic fibers synapse in the chain ganglia
Preganglionic fibers run from the ________ to the ________.
A. autonomic ganglia; visceral effectors B. posterior root ganglia; autonomic ganglia C. gray matter; posterior root ganglia D. gray matter; autonomic ganglia E. posterior root ganglia; gray matter