If a cell lacked lysosomes, it would not be able to
A) digest cellular wastes and bacteria.
B) transport water-soluble molecules.
C) synthesize lipids.
D) destroy H2O2.
E) produce enzymes.
A) digest cellular wastes and bacteria.
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RBC is the abbreviation for ________
A) Red blood cells B) Red and blue circulation C) Ruptured blood clot D) Really bad cut
To initiate a smooth muscle cell contraction, calcium enters the cell and binds to
A. troponin, which then activates myosin light-chain kinase. B. calmodulin, which then binds to and activates myosin light-chain kinase. C. a myosin head, which then activates calmodulin. D. myosin light-chain kinase, which then hydrolyzes ATP. E. a phosphatase, which then removes the tropomyosin blockade.
Action potentials are generated by ion movements through
A. chemically regulated gates. B. active ion pumps. C. leakage ion channels. D. voltage-regulated gates.
When the inspiratory muscles relax, the rib cage returns to its original position as a result of
A) exhalation. B) gravity. C) elastic rebound. D) accessory muscle contraction. E) partial pressure difference.