For a neuron at rest, the concentration gradient for sodium is such that there is a higher concentration of sodium
A. inside the cell.
B. outside the cell.
Answer: B
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Pacemaker cells in the SA node
A) have a well-defined resting potential. B) generate action potentials that spread to the myocardium. C) are highly contractile. D) have an action potential identical to contractile cardiac muscle cells. E) are located in the left atrium.
The lateral horns of the spinal cord contain
A. axons of motor neurons and interneuron cell bodies. B. axons of sensory and motor neurons. C. cell bodies of somatic sensory neurons. D. axons of sensory neurons and interneuron cell bodies. E. cell bodies of autonomic motor neurons.
Answer the following statements true (T) or false (F)
1. Hyperventilation would remove more carbonic acid than normal and would cause a drop in blood pH. 2. The lung is the most effective regulator of body pH. 3. The kidney is the most effective regulator of body pH. 4. The kidneys are able to remove base from the body, the lungs can remove only acid. 5. In Bowman’s capsule, carbon dioxide and water join to become carbonic acid.
A graph of a muscle twitch contains three periods. The period during which there is no change in external muscle tension (and no change in muscle length) is the ________ period.
Fill in the blank(s) with the appropriate word(s).