In mammals, a decrease in body temperature results in which of the following responses?
(A) Release of thyroxine decreases the rate of metabolism.
(B) Blood vessels close to the surface of the skin constrict.
(C) vessels in deep muscles constrict so Increased secretion of epinephrine restricts the amount of sugar released into the circulatory system.
(D) The adrenal glands increase the release of acetylcholine into the circulatory system.
(E) Blood that heat is conserved
Ans: (B) Blood vessels close to the surface of the skin constrict.
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The fewer muscle fibers present in a motor unit:
A. the weaker the contractions of muscle fibers in that motor unit. B. the greater the control over the movement(s) that result from stimulation of that motor unit. C. the less likely an action potential will be generated in the muscle fibers of that motor unit. D. the less likely these muscle fibers will fatigue.
The term "DNA sequence" refers to the:
a. order of nucleotides in a strand of DNA b. number a nucleotides in a strand of DNA c. number of chromosomes in a nucleus d. number of hydrogen bonds in a strand of DNA e. identity of genes in a strand of DNA
Which one of the following is a defining characteristic of animals but not of plants?
A) Autotrophic B) Heterotrophic C) Eukaryotic D) Prokaryotic
Anaerobic cellular respiration
A. is also called fermentation. B. only involves glycolysis. C. does not generate ATP. D. utilizes an electron transport system. E. uses the same final electron acceptors as aerobic respiration