What is the purpose of spermatogenesis?
A. To produce four cells, each with 23 chromosomes, from a specialized stem cell with 46 chromosomes
B. To produce four cells, each with 23 chromosomes, from a specialized stem cell with 23 chromosomes
C. To produce two cells, each with 23 chromosomes, from a specialized stem cell with 46 chromosomes
D. To produce four cells, each with 23 pairs of chromosomes, from a specialized stem cell with 46 chromosomes
Answer: A
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Which of the following statements about the action potential is false?
A) The rapid depolarization phase is caused by the entry of potassium ions. B) During the repolarization phase, sodium channels close and potassium channels open. C) During the depolarization phase, membrane potential becomes positive. D) During the hyperpolarization phase, the ion pumps re-establish the sodium and potassium concentrations across the cell membrane. E) Repolarization occurs as potassium ions leave the axon.
The ____________________ or ____________________ of a nerve cell is a single, elongated tubular process that conducts action potentials away from the cell body and eventually terminates at other cells
Fill in the blank(s) with correct word
Intramembranous ossification occurs in:
A) arm and leg bones. B) long bones. C) skull bones. D) secondary bone.
What vein returns blood from the upper part of the body to the heart?
A. Inferior vena cava B. Inferior mesenteric vein C. Superior vena cava D. Hepatic portal vein