Which receptor type mediates the slow phase of synaptic transmission in autonomic ganglia?
AMuscarinic (M3)
BMuscarinic (M2)
CMuscarinic (M1)
DNicotinic (N2)
An investigator is developing a drug for muscle spasms. The drug inactivates muscular contraction by blocking the site where calcium ions bind to regulate actin-myosin interaction. Which of the following is the most likely site of action of this drug?
ATroponin C
BMyosin-binding site
CAcetylcholine receptor
DRyanodine receptor
EMyosin head
A 59-year-old male presents to the emergency room complaining of substernal chest pain. He reports a three-hour history of dull substernal chest pain that radiates into his left arm and jaw. He has experienced similar chest pain before that was brought on with exertion, but this pain is more severe and occurred with rest. His past medical history includes gout, hypertension, diabetes mellitus, and hyperlipidemia. An EKG demonstrates ST segment depression. Serum troponin is elevated. In addition to aspirin, oxygen, and morphine, he is started on a sublingual medication. What is the main physiologic effect of this medication?
ADecrease preload
BDecrease heart rate
CIncrease contractility
DIncrease preload
EDecrease afterload
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