The only energy source that can be used directly by the contractile machinery of a muscle fiber is ____________________
Fill in the blank(s) with correct word
ATP
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When NAD+ becomes NADH, it is being
A. reduced and gaining chemical energy. B. reduced and releasing chemical energy. C. oxidized and gaining chemical energy. D. oxidized and releasing chemical energy.
Short reflexes of the digestive system are integrated in the ________.
Fill in the blank(s) with the appropriate word(s).
Oxygen in the lung:
a. is actively transported out of the lung b. converts hemoglobin to oxyhemoglobin c. converts oxyhemoglobin to hemoglobin d. both A and B above
The normal sequence of structures activated for signal transmission and response in the body is
a. effector--afferent neuron--interneuron--efferent neuron-receptor. b. effector--efferent neuron--interneuron--afferent neuron-receptor. c. receptor--afferent neuron--interneuron--efferent neuron-effector. d. receptor--efferent neuron--interneuron--afferent neuron-effector.