Harmful or disease-causing microorganisms from which nonspecific defenses protect the body are called ________.

The atrioventricular valve on the left side of the heart is often called the

Chemotaxis is best described as ________.

Each cardiac muscle cell is bound to its neighboring cells at sites called ________.

Antigen-presenting cells behave as ________.

Blood is returned to the right side of the heart from the lungs.

The average heart beats approximately 75 times each minute at rest.

If the SA node becomes damaged and nonfunctional, which of these is the most likely to occur?

Different types of capillaries are found in different parts of the body. Match each specific capillary to its specific organ?

A layer of blood vessel wall which contains the greatest amount of smooth muscle tissue and is thus involved in vasoconstriction and vasodilation of the blood vessel is known as