During their period of systole, the inner volume of the atrial chambers
A) decreases.
B) remains the same, but the auricles enlarge rapidly.
C) does not change.
D) increases, as does the volume in the auricles.
E) None of the answers are correct.
A) decreases.
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A lengthwise cut that divides the body into right and left portions is termed ________.
Fill in the blank(s) with the appropriate word(s).
Match the answers to the questions.
1. The ganglia are found in a chain that runs close to the spinal cord or along the descending aorta. 2. It releases norepinephrine at the neuroeffector synapse. 3. It contains cholinergic neurons. 4. The adrenal medulla is closely allied with this system. 5. On average, one preganglionic neuron synapses with eight or nine postganglionic neurons, each innervating a different target. 6. It is important during stress or emergencies (fight-or-flight). 7. It dominates during resting-and-digesting activities. A. true only for the sympathetic division B. true only for the parasympathetic division C. true for both divisions
A lack of ATP in a contracted skeletal muscle cell would most likely cause
a. cross bridges to detach from actin b. the sarcomeres to remain shortened c. an inability to relax d. both a and c e. both b and c
The ________ surrounds a bundle of nerve fibers
A) epineurium B) endoneurium C) perineurium D) None of the answers are correct.