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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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.
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