Explain the role G-proteins play in taste sensation
What will be an ideal response?
Receptors for bitter, sweet, and umami compounds activate a G-protein that indirectly closes potassium ion channels involved in the leak current. Due to the activity of the G-protein, the decreased movement of potassium ions out of the cell produces depolarization. Depolarization leads to a graded potential that spreads along the membrane of the small gustatory cells, making an action potential unnecessary.
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Which of the following is not a function of the nurse cells?
A. They secrete inhibin. B. They secrete testosterone. C. They secrete androgen-binding protein. D. Their tight junctions form the blood-testis barrier. E. They protect and support the germ cells.
A primary function of the cerebellum is to ________.
A. regulate consciousness B. coordinate movement C. control body temperature D. interpret sound E. regulate sleep patterns
HIV weakens the immune system by
A) overwhelming it with infection. B) destroying antibodies. C) attacking T cells. D) attacking B cells. E) All of the answers are correct.
A seventy-five-year-old male has noticed he has had difficulty urinating. His physician says his difficulty is most likely due to an enlarged gland known as the:
A) epididymis. B) seminal vesicle. C) bulbourethral gland. D) prostate.