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

The QRS complex of an ECG corresponds to

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

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

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.

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

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.

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

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

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