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The depolarization of the pacemaker action potential spreads to adjacent cells through

In mammals, urine drains out of the ____ into a collecting duct.​

The term myogenic indicates that the heart muscle is the source of

The QRS complex of an ECG corresponds to

Blood enters the glomerulus by an _____ and leaves by an _____.

Each red blood cell is shaped as a biconcave disk. This allows it to

In the mammalian heart, the systemic and pulmonary circuits ____.​

Plasma makes up approximately ____ percent of the total blood volume.​

The ____ are the initial branches of the trachea that lead into each lung.​

Kidneys regulate