The parasympathetic nervous system dominates in situations when a person is afraid
Indicate whether the statement is true or false
F
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During amniocentesis
A. a needle removes cells from the fetus. B. a piece of the placenta is snipped off and examined for abnormal cells. C. blood is removed from a woman's arm and fetal cells isolated and their chromosomes karyotyped. D. fetal fibroblasts in amniotic fluid are cultured and a karyotype constructed.
The variables of oxygen consumption, cardiac output, and blood oxygen content are unrelated.
A) True B) False
Depolarization of an axon is a positive feedback mechanism because ________.
A. as more sodium channels open, the membrane potential decreases B. as more sodium diffuses into the axon, the more voltage-gated sodium channels open C. as more potassium channels open, the membrane potential decreases D. as more sodium diffuses into the axon, the more voltage-gated potassium channels open
If the extracellular fluid around a neuron is replaced with an isotonic saline solution that contains K+ and other solutes at concentrations very close to the extracellular fluid concentrations of a normal cell, the result is
A. hyperpolarized membrane. B. no resting membrane potential. C. a resting membrane potential close to its normal value. D. depolarized membrane. E. None of the choices are correct.