The thirst center in the hypothalamus is stimulated by ________ of the extracellular fluid, and is inhibited by ________.
A. a decrease in sodium ions; an increase in sodium ions
B. a decrease in the osmotic pressure; stimulation of osmoreceptors
C. nerve impulses from the cerebrum; nerve impulses from the thalamus
D. an increase in the osmotic pressure; distension of the stomach by water
Answer: D
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The enzymatic breakdown of any type of food molecule is called ________.
A) diffusion B) active transport C) hydrolysis D) denatured
Which is a correct listing of the hierarchy of a skeletal muscle's components, beginning with the smallest?a: Myofibrilsb: Muscle fiberc: Fascicled: Skeletal muscle
A. d, c, b, a B. a, c, b, d C. b, c, a, d D. c, b, a, d E. a, b, c, d
Which statement is true about up-regulation and down-regulation?
A. Up-regulation is the increase in the number of receptors for a given hormone and down-regulation is the decrease in the amount of hormone. B. Up-regulation is the increase in the amount of hormone and down-regulation is the decrease in the amount of hormone. C. Up-regulation is the increase in the number of receptors for a given hormone and down-regulation is the decrease in the number of receptors for a hormone. D. Up-regulation is the decrease in the number of receptors for a given hormone and down-regulation is the increase in the number of receptors for a hormone.
Most of the oxygen transported by the blood is
A) dissolved in plasma. B) bound to hemoglobin. C) in ionic form as solute in the plasma. D) bound to the same protein as carbon dioxide. E) carried by white blood cells.