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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

Osmoconformers tend to live in environments with variable solute concentrations.

Amphibians often use ____ as a respiratory surface.​

BONUS Your kidneys filter your blood about _____ times per day and reabsorb _____% of the water entering the renal tubules, _____% of the electrolytes in the blood, and _____% of the glucose and amino acids that were filtered out of the blood in the glomerulus.