Somatic motor neurons release the neurotransmitter ________ at the neuromuscular junction.
A. acetylcholine
B. dopamine
C. serotonin
D. norepinephrine
Answer: A
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Which of the following supplies blood to the small intestine?
A) splenic artery B) right gastric artery C) gastroduodenal artery D) left gastric artery E) superior mesenteric artery
Which of the following choices lists a correct sequence of events following the depolarization of transverse tubules in excitation-contraction coupling in cardiac muscle?
A. Calcium ion influx through sarcolemma, calcium release into cytosol, actin and myosin attach, thin myofilaments slide toward the middle of sarcomeres B. Calcium release into cytosol, actin and myosin attach, calcium ion influx through sarcolemma, thin myofilaments slide toward the middle of sarcomeres C. Calcium release into cytosol, calcium ion influx through sarcolemma, actin and myosin attach, thin filaments slide toward the middle of sarcomeres D. Calcium release into cytosol, actin and myosin attach, thin filaments slide toward the middle of sarcomeres, calcium ion influx through sarcolemma E. Actin and myosin attach, thin filaments slide toward the middle of sarcomeres, calcium release into cytosol
In which of the following spaces is the pterygoid plexus of veins located?
A. Temporal B. Infratemporal C. Buccal D. Parapharyngeal
Mesenchyme gives rise to ________
A) reproductive and urinary systems B) digestive organs and endocrine glands C) nervous tissue D) the integumentary system and exocrine glands E) muscle, bone, and blood