Medical Assisting: Chp 25 Review

The purpose of the four valves of the heart is to ___.

• ensure a one-way blood flow

• keep the blood in the correct chamber

• maintain blood pressue

Body cells surrounding capillaries usually have a ___.

• high oxygen concentration

• low oxygen concentration

• low carbon dioxide concentration

Water is forced through capillary walls by ___.

• filtration

• osmosis

• diffusion

A person's blood pressure is a reflection of ___.

• osmotic pressure

• venous pressure

• arterial pressure

Blood pressure is greatest in the arteries ___.

• when the atria contract

• when the ventricles contract

• when the heart is between contraction and relaxation

Myocardial infarctions result from ___.

• damaged heart valves

• obstruction of blood to the heart muscle

• a weakened heart muscle

The ___ lies on top of the visceral pericardium.

• parietal pericardium

• epicaridum

• myocardium

Which of these covers the heart and the large blood vessels attached to it?

• Pericardium

• Endocardium

• Epicardium

The ___ lies directly on the heart.

• myocardium

• parietal pericardium

• visceral pericardium

Which of the following is the thickest layer of the heart, which is made up of muscle?

• Endocardium

• Pericardium

• Myocardium