Which statement is true?

a. the autonomic nervous system has no effect on the heart
b. the AV node can generate electrical impulses just as quickly as the SA node
c. If the pacemaker of the heart fails, then heart will stop beating
d. if the pacemaker of the heart stops, the AV node will take over


Answer: d. if the pacemaker of the heart stops, the AV node will take over

Anatomy & Physiology

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When a hormone binds to a membrane–bound receptor and activates G proteins,

A. ion channels could be opened. B. IP3 may be activated. C. cyclic AMP production may be increased. D. DAG may be activated. E. All of the choices may occur from activated G proteins.

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The torque of a muscle (rotary component) is greatest in what position?

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A cell in the pancreas that secretes an enzyme to hydrolyzes lipids would be expected to have

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Anatomy & Physiology