Which of these would result in an increase in the osmolarity of urine?
A. increased levels of vasopressin in the plasma
B. increased levels of aldosterone in the plasma
C. decreased transport of Na+ and Cl- by the ascending limb of the loop of Henle
D. ingestion of a large volume of pure water
E. decreased urea permeability of the medullary collecting duct
A
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Features of the submucosa include
A) blood, lymph vessels, a major nerve network, and Peyer's patches. B) blood and lymph vessels. C) blood, lymph vessels, and a major nerve network. D) a major nerve network. E) Peyer's patches.
The thermoneutral zone is defined as:
A. the region in the central core of the body where temperature never changes. B. the core body temperature at which no energy is expended to maintain homeostasis. C. the environmental temperature range over which the changes in skin blood flow alone can regulate body temperature. D. the region of the body halfway between the high-temperature core and the low-temperature skin. E. the environmental temperature range in which shivering, changes in blood flow, and changes in thyroid hormone concentrations can maintain homeostasis of the body's core temperature.
Which of the following organelles is not part of the endomembrane system?
A. vesicles. B. mitochondria. C. rough ER. D. Golgi apparatus.
Gonadotropin-releasing hormone (GnRH) regulates the release of
A. prolactin and oxytocin. B. follicle-stimulating hormone and luteinizing hormone. C. estrogen and testosterone. D. progesterone and prolactin. E. thyrotropin-releasing hormone and thyroid-stimulating hormone.