Which is the neurotransmitter that causes the release of calcium ions and initiates the steps of skeletal muscle fiber contraction?

A. Acetylcholine
B. Acetylcholinesterase
C. Norepinephrine
D. Serotonin


Answer: A

Anatomy & Physiology

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Coronary vessels are open when the heart is

A. relaxed. B. contracting.

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What are the two subdivisions of the autonomic nervous system (ANS)?

a. superior and inferior b. sympathetic and parasympathetic c. spinal and limbs d. internal and external e. efferent and afferent

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Which of the following cells secretes CSF into the ventricles of the brain?

A) microglia B) basal nuclei C) ependymal cells D) substantia nigra

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