Which muscle is the prime mover of shoulder abduction (abduction of the arm)?
A) supraspinatus
B) infraspinatus
C) subscapularis
D) deltoid
Answer: D) deltoid
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Which of the following structures sets the pace of heart contraction?
atrioventricular bundle SA node bundle branches AV node
Anaphase is characterized by ________
A) separation of the sister chromatids B) breakdown of the nuclear membrane C) duplication of the chromosomes D) division of the cytoplasm
How does the chemical curare affect skeletal muscle function?
A. It activates an autoimmune disease that destroys myelin. B. It blocks the action of acetylcholinesterase at the neuromuscular junction. C. It is a muscarinic acetylcholine receptor antagonist that blocks synaptic transmission at the neuromuscular junction. D. It is a nicotinic acetylcholine antagonist that blocks synaptic transmission at the neuromuscular junction. E. It locks ligand-gated channels in the open state, leading to spastic contractions of muscle.
When aldosterone is absent, sodium reabsorption in the nephron is
A. greatly increased. B. greatly decreased. C. unchanged.