Rings of muscle in the digestive tract that can open and close, regulating the movement of food into or out of parts of the digestive system, are
A. rumens.
B. sphincters.
C. chymes.
D. villi.
E. uvulas.
B. sphincters.
Biology & Microbiology
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In general, neurons are locked into G1
a. True b. False
Biology & Microbiology
Plasmodium is
a. an apicomplexan. b. a diatom. c. a ciliate. d. a dinoflagellate. e. a flagellated protozoan
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The path to a myocardial infarction starts with a fat-filled plaque blocking a coronary artery. This condition is called ________
A) atherosclerosis B) coronary bypass C) a stent D) angioplasty
Biology & Microbiology
Which statement about radiolarians is FALSE?
a. They are rhizarians. b. They have axopods. c. They are actinopods. d. They lack silica shells. e. They have algal endosymbionts
Biology & Microbiology