A 50-year-old man presents with a painful penile erection that has persisted for the past several hours. He is conscious, but restless, and his vital signs are stable. Which of the following conditions could cause his clinical presentation?
A) Renal failure
B) Head trauma
C) Cocaine abuse
D) Nitroglycerin use
Answer: C) Cocaine abuse
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Axodendritic synapses are composed of __________ for the presynaptic cell and __________ for the postsynaptic cell
A) Axons; axons B) Dendrites; axons C) Axons; dendrites D) Axons; cell somas Fill in the blanks with the correct answer.
The single structure that allows locomotion in some cells is the
A) histone. B) cilium. C) microfilament. D) flagellum. E) intermediate filament.
In which type of bone tissue are osteoblasts and osteoclasts present?
A. Spongy bone B. Compact bone C. Both "spongy bone" and "compact bone" are correct.
What is the glutamic acid made from transamination used for?
A. It is used to produce ATP. B. It enters the citric acid cycle. C. It is used to make other nonessential amino acids. D. None of the choices are correct.