Which muscle is the prime mover of shoulder abduction (abduction of the arm)?

A) supraspinatus
B) infraspinatus
C) subscapularis
D) deltoid


Answer: D) deltoid

Anatomy & Physiology

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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.

Anatomy & Physiology

When aldosterone is absent, sodium reabsorption in the nephron is

A. greatly increased. B. greatly decreased. C. unchanged.

Anatomy & Physiology

Which of the following structures sets the pace of heart contraction?

atrioventricular bundle SA node bundle branches AV node

Anatomy & Physiology

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

Anatomy & Physiology