The figure illustrates changes in the membrane potential during an action potential. What does "D" represent?
A. Local potential
B. Repolarization
C. Afterpotential
D. Depolarization
E. Threshold
Answer: E
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A major body part derived from endoderm is
A. the muscles. B. the epithelial lining of the digestive tract. C. nervous tissue. D. the epidermis of the skin.
When multiple presynaptic neurons release neurotransmitter at various locations onto the postsynaptic neuron at the same time, this results in
A. suprathreshold hyperpolarization. B. temporal summation. C. spatial summation. D. several action potentials.
List 3 items that may be placed in a tank to protect eggs
What will be an ideal response?
The primary role of the carbonic acid-bicarbonate buffer system is to
A) buffer stomach acid. B) buffer carbonic acid formed by carbon dioxide. C) limit pH changes caused by organic and fixed acids. D) buffer the urine. E) increase ventilation.