The middle layer of the wall of an artery or vein is made up of
A. valves.
B. skeletal muscle.
C. smooth muscle.
D. endothelium.
E. simple squamous epithelial cells.
C. smooth muscle.
Biology & Microbiology
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If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants' environment?
A) carbon dioxide B) cytokinins C) ethylene D) auxin E) gibberellic acids
Biology & Microbiology
As temperature increases, the rate of diffusion ________
a. increases. b. decreases. c. remains the same.
Biology & Microbiology
Tundra occurs only at high latitudes in polar regions
Indicate whether the statement is true or false
Biology & Microbiology
In a muscle cell, sarcomeres are the:
A) thin filaments. B) myofibrils that run the length of the cell. C) thick filaments. D) fundamental units of muscle contraction.
Biology & Microbiology