Acetylcholine is the main neurotransmitter released by:
A. preganglionic sympathetic neurons and cells of the adrenal medulla.
B. cells of the adrenal medulla and postganglionic parasympathetic neurons.
C. motor neurons and postganglionic sympathetic neurons.
D. preganglionic sympathetic neurons and postganglionic sympathetic neurons.
E. preganglionic sympathetic neurons and motor neurons.
E
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The __________ is a collagenous collar that encloses most of the bone.
Fill in the blank(s) with the appropriate word(s).
This bone condition occurs most frequently in postmenopausal women with calcium deficiencies
A) Osteomalacia B) Osteoporosis C) Paget's disease D) Rickets
What part of the midbrain influences the activity of the entire nervous system?
A) cerebral peduncles B) substantia nigra C) superior colliculi and inferior colliculi D) red nuclei E) reticular activating system (RAS), a part of the reticular formation
What would be the clinical significance of a positive Babinski sign in an adult?
A) damage to the descending (motor) tracts in the spinal cord, indicating possible spinal cord damage B) muscle spindle damage C) incomplete myelination D) sensory neuron damage in the spinal cord