As an object moves closer to the eye,
A. the lens flattens.
B. the eyes rotate medially.
C. the ciliary muscles relax.
D. the diameter of the pupil increases.
E. the eye blinks.
B
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Manganese ions block the calcium channels in the cardiac muscle membrane. How would the presence of manganese in the extracellular fluid affect the contraction of the heart muscle?
A) The refractory period would be shorter. B) The plateau phase of contraction would be longer. C) The contraction phase would be prolonged. D) The heart rate would increase. E) The heart would beat less forcefully.
The ____ tonsils are located at the back surface of the tongue at its base
a. palatine b. lingual c. pharyngeal d. adenoidal
What process propels urine from the kidney to the urinary bladder in the ureters?
A) osmosis B) peristalsis C) secondary active transport D) segmentation
________ are arranged within a lobule of the liver into a series of plates converging toward a central vein
A) Kupffer cells B) Hepatocytes C) Bile canaliculi D) Portal areas E) Hepatic ducts