A patient is prescribed a calcium channel blocker to prevent angina (chest pain), by decreasing the demand for oxygen. Explain why.
What will be an ideal response?
By preventing the influx of calcium ions into myocardial and vascular smooth muscle cells, calcium channel blockers inhibit the intracellular release of additional stores of calcium ions. A drug that inhibits the release of intracellular calcium ions decreases the force of myocardial contractility, thereby decreasing the oxygen demand.
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Hyaline cartilage is typically found at bone interfaces (joints).
a. True b. False
The ________ is not a portion of the urethra.
A. internal urethral sphincter B. spongy urethra C. external urethral orifice D. prostatic urethra E. membranous urethra
Which of the following occurs at ovulation?
A. The first meiotic division of the oocyte completes and the dominant follicle ruptures. B. The second meiotic division of the oocyte occurs. C. The oocyte, along with its surrounding thecal layer, is expelled onto the ovarian surface. D. The second meiotic division of the oocyte occurs and the dominant follicle ruptures. E. The corpus luteum is expelled from the ovary and enters the fallopian tube.
________ stimulates the production of sperm in testes.
A. Growth hormone B. Prolactin C. Luteinizing hormone D. Oxytocin E. Follicular-stimulating hormone