Which of the following has been shown to be associated with how long an animal might be expected to live (lifespan)?
a. the amount of RNAi in cells
b. the number of pseudogenes
c. the amount of junk DNA
d. the length telemeres
e. none of these has been found to have any effect on the lifespan of an organism.
D
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The osteon is ________.
a fibrous membrane that covers and protects bone the structural unit of compact bone the structural unit of spongy bone a network of red marrow
Action potentials from sympathetic neurons ________ glomerular filtration rate by causing ________.
A. increase; dilation of afferent glomerular arterioles B. increase; dilation of efferent glomerular arterioles C. decrease; constriction of afferent glomerular arterioles D. decrease; constriction of efferent glomerular arterioles
What organs appear very early in development?
A) lungs and alimentary canal B) skeletal muscles C) brain and heart D) kidneys and glands
When the sciatic nerve was chilled with iced Ringer's solution, ________
A) the compound action potential was unchanged B) it became very excitable, generating large compound action potentials to small stimuli C) it became inexcitable or required a stimulus much greater than normal to produce a compound action potential