Heart (Chapter 14)

The heart is located in the mediastinum.

True

Cardiopulmonary resuscitation (CPR) is successful because of the heart"s location in the body.

True

The ventricles are the receiving chambers of the heart.

False

The heart is doing the most work during systole.

True

A stenosed pulmonary semilunar valve slows the blood moving into the artery that leads to the lung.

True

The atrioventricular node is sometimes called the pacemaker for the heart.

False

If a patient has an AV node block, the electrocardiogram will show that the ventricles are beating at a faster rate than the atria.

False

A heart rate less than 55 beats per minute indicates bradycardia.

True

A heart rate of 110 beats per minute indicates tachycardia.

True

A person with bradycardia has more QRS complexes per minute on an electrocardiogram than a person with tachycardia.

False

a loose-fitting sac around the heart

parietal pericardium

the receiving chambers of the heart

atria

the volume of blood ejected from the ventricles during each beat

stroke volume

a thin layer of smooth tissue that lines the chambers of the heart

endocardium

part of the conduction system of the heart called the pacemaker

sinoatrial node

another term for the epicardium

visceral pericardium

term that describes contraction of the heart

systole

the discharging chambers of the heart

ventricles

the volume of blood pumped by one ventricle per minute

cardiac output

the resting time of the heart between beats

diastole

valve that keeps blood from flowing back into the left ventricle

aortic semilunar valve

chamber into which blood from the inferior vena cava drains

right atrium

blood vessel that carries blood back to the heart from the lungs

pulmonary vein

heart chamber that pumps blood through the aortic semilunar valve

left ventricle

blood vessel into which blood that has flowed from the right ventricle and passed through a valve enters next

pulmonary artery

heart chamber into which blood returning from the lungs enters

left atrium

valve through which blood leaving the right ventricle passes on its way to the lung

pulmonary semilunar valve

blood vessel that empties into the right atrium

superior vena cava

heart chamber that blood enters after passing through the tricuspid valve

right ventricle

valve that prevents blood from backing up into the right atrium

tricuspid valve