The production and conduction of action potentials in the heart produces a recordable tracing of the electrical activity of the heart called a(n) ________.
A. heart scan
B. depolarization
C. EMG
D. ECG
Answer: D
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An important mechanism that controls metabolic pathways under physiological conditions is
A. negative feedback. B. positive feedback. C. signal transduction. D. genetic control.
. Which of the following statements about membrane potentials in different types of cardiac cells is TRUE?
A. Myocardial cells have a resting membrane potential of about -90 mV; pacemaker cells do not have a true resting membrane potential. B. Once threshold depolarization is reached in both myocardial and pacemaker cells, the rapid upswing of the action potential is caused by the opening of voltage-gated Na+ channels C. Voltage-gated transient (T-type) Ca2+ channels are present in all of the different types of cells of the heart. D. There are no L-type Ca2+ channels in cardiac muscle cells. E. The upstroke of the action potential is steeper in SA node cells than it is in Purkinje cells.
ADH promotes ________.
A. water and sodium excretion by the kidneys B. water retention by the kidneys C. water excretion by the kidneys D. water and sodium retention by the kidneys
The neuronal relationship where many presynaptic cells terminate on a single postsynaptic cell is called ____________________
Fill in the blank(s) with correct word