The ________ supplies muscles and other tissues of the neck, shoulder, and upper back.
A) vertebral artery
B) internal thoracic artery
C) axillary artery
D) brachial artery
E) thyrocervical trunk
E) thyrocervical trunk
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Cardiac muscle cells obtain energy almost exclusively through
A) anaerobic pathways. B) protein stores. C) glycolysis. D) aerobic respiration. E) the Krebs cycle.
What is the importance of the delay in the action potential in the AV node?
A. It allows the action potential to reach both ventricles at the same time. B. It allows an action potential to reach the left atrium so both atria contract together, before the ventricles contract. C. It allows time for the atria to fill with blood. D. It allows an action potential to reach the left atrium so both atria contract together.
The ________ division tends to prepare the body for action.
A. sensory afferent B. somatic motor C. parasympathetic D. sympathetic E. motor afferent
In males, conversion of testosterone to estrogen in the brain is essential for normal regulation of LH secretion.
Answer the following statement true (T) or false (F)