Where do preganglionic fibers of the parasympathetic system originate?
A. The paravertebral ganglia
B. The brain stem and sacral region of the spinal cord
C. The cerebral cortex
D. The lateral horns of the spinal cord from T1 through L2
E. The thoracolumbar region of the spinal cord
Answer: B
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Sympathetic stimulation of cardiac muscle cells produces stronger and faster contractions because proteins that pump Ca2+ out of the cell are inhibited, which reduces Ca2+ concentration in the sarcoplasm.
Answer the following statement true (T) or false (F)
The motor root of a spinal nerve is also referred to as the ________ root.
A. dorsal B. sensory C. posterior D. ventral E. afferent
What is largest artery in the body?
A) brachiocephalic artery B) pulmonary trunk C) aorta D) common carotid artery
A by-product of anaerobic respiration in muscle fibers is
A. uric acid. B. pyruvate. C. oxygen. D. lactate. E. hydrochloric acid.