Myocardial cells exhibit a plateau phase instead of quickly repolarizing. This is due to ________.
A. inward diffusion of sodium through fast Na+ channels
B. inward diffusion of potassium through voltage-gated K+ channels
C. inward diffusion of calcium through slow Ca2+ channels
D. outward pumping of sodium by the Na+/K+ pump
Answer: C
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Which of the following drugs is most likely to cause sexual dysfunction in males?
a) Selective serotonin reuptake inhibitors (SSRIs) b) Angiotensin-converting enzyme (ACE) inhibitors c) Amphetamines d) Atypical antidepressants
Which of these is not found in the karyotype of a normal human male?
A. X and Y chromosomes B. 23 pairs of homologous chromosomes C. 92 DNA molecules D. 46 chromosomes E. 46 chromatids
In the reactions that occur in metabolism, enzymes function as
A. catalysts. B. compounds. C. lipids. D. amino acids.
Which wave on the ECG shows the depolarization of the atria?
A. Q, R, S B. T C. P D. None of these are correct.