If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells, ________
A) contractions would last as long as the refractory period
B) tetanic contractions might occur, which would stop the heart's pumping action
C) pacemaker cells would cease to spontaneously depolarize
D) it would be much longer before cardiac cells could respond to a second stimulation
B
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Neurotransmitters ________.
A. bind to chemically regulated channels B. bind to voltage-gated channels C. are released by endocytosis D. are actively transported across the synaptic cleft
The process of deamination produces
A) keto acids. B) high levels of proteins. C) an ammonium ion. D) acetyl CoA. E) B vitamins.
In meiosis the spermatozoa that are produced are genetically unlike each other and unlike the cell that produces them. This is one reason for the great variation among humans. What causes this effect?
A) chromosome segregation and independent assortment only B) crossing-over and chromosome segregation only C) crossing-over and independent assortment only D) crossing-over, chromosome segregation, and independent assortment