Pacemaker activity refers to spontaneous depolarizations resulting from
a. shifts in passive ionic fluxes accompanying
b. cyclical changes in Na+-K+ pump activity
c. automatic changes in channel permeability
d. both a and b
e. both a and c
A
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Permanent alterations in a cell's DNA that affect the nucleotide sequence of one or more genes are called
A) interferons. B) mutations. C) reconstructions. D) polymorphs. E) changelings.
How do the cells of the suprarenal medulla differ from other glandular cells?
A) They do not differ from other cells. B) They are chief cells that have migrated from the kidneys. C) They are a modified parasympathetic ganglion. D) They form from modified sympathetic ganglionic neurons. E) None of the answers are correct.
Nutrition includes the study of
A. how nutrients play a role in your body's health. B. the nutrients in foods. C. digestion, absorption, and transportation of nutrients. D. the body's utilization of nutrients. E. All of these choices are correct.
Summarize the components of an osteon of compact bone tissue
What will be an ideal response?