The amount of melatonin secreted by the pineal gland is regulated by
A. the stress response.
B. blood glucose levels.
C. a person's individual metabolic rate.
D. the amount of sleep a person gets.
E. the photoperiod (the daily amount of daylight).
E
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Which of the following is not associated with an increase in stroke volume?
a. increased end-diastolic volume b. increased contractility of the heart c. increased end-systolic volume d. increased preload e. increased venous return
A student in your lab volunteers to enter a hypoxic breathing chamber for 10 minutes, and his alveolar PO2 drops to 50 mm Hg. What other change would occur?
A) increase in alveolar PCO2 B) decrease in pH of cerebrospinal fluid C) decrease in arterial PCO2 D) decrease in arterial pH E) hypoventilation
The system responsible for providing protection, regulating body temperature, and being the site of cutaneous receptors is the ________ system.
A. respiratory B. integumentary C. nervous D. muscular E. urinary
A 30-year-old man is referred to a gastroenterologist for evaluation of persistent dyspepsia (indigestion)
He is noted to have other symptoms, including flushing and hypotension, and following a bone marrow biopsy, is diagnosed with systemic mastocytosis (an excessive proliferation of histamine-containing mast cells). An increased propensity for gastric and duodenal ulcers in this patient is likely ascribable to overproduction of which of the following second messengers in gastric parietal cells? A. calcium B. inositol trisphosphate C. diacyglycerol D. cGMP E. cAMP