At the normal resting membrane potential of a typical neuron, its sodium-potassium exchange pump transports
A) 1 intracellular sodium ion for 2 extracellular potassium ions.
B) 2 intracellular sodium ions for 1 extracellular potassium ion.
C) 3 intracellular sodium ions for 1 extracellular potassium ion.
D) 3 intracellular sodium ions for 2 extracellular potassium ions.
E) 3 extracellular sodium ions for 2 intracellular potassium ions.
D
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Which of the following are functions of proteins?
A) support B) defense C) metabolic regulation D) buffering E) All of these are functions of proteins.
In response to high blood glucose, the pancreas releases insulin to enable glucose to enter body cells. When the blood glucose level returns to normal, insulin release stops. This is an example of regulation by
A. endocrine dysplasia. B. negative feedback. C. positive feedback. D. neural regulation. E. somatic regulation.
The first signal during helper T-lymphocyte activation involves
A. BCR of the helper T-cell binding with free antigen and engulfing it. B. CD8 of the helper T-cell binding with MHC class III of the antigen-presenting cell. C. CD4 of the helper T-cell binding with MHC class I part of the antigen fragment. D. CD4 of the helper T-cell binding with MHC class II of the antigen-presenting cell.
The ________ contains the sensory receptors for hearing
A) eustachian tube B) cochlea C) ampulla D) vestibule