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

Use the accompanying figure and list of structures below to label the diagram of the human heart.​

The most important factor affecting the pH of plasma is the concentration of

Imagine that you are studying a new species.  As you examine the circulatory system, you note that a four-chambered heart drives the blood in two directions simultaneously; to the body and to the lungs.  What can you conclude about this animal?  Check all that apply.

To form a blood clot, a series of plasma proteins must activate in a given sequence. If DNA info for one such protein mutates such that the resulting protein is nonfunctional, predict the consequence.

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.

These are the only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart.

The percentage of whole blood occupied by red blood cells is the

The main form of nitrogenous wastes released by aquatic invertebrates to their environment is ____.​