ch 19 heart - mc questions

Which statement correctly describes the pulmonary circuit?

It sends oxygen-poor blood to the lungs and returns oxygen-rich blood to the heart

Which structure carries oxygen-rich blood to the body?

Aorta

The heart is located in the:

Mediastinum

The apex of the heart:

Points toward the left hip

Which structure carries oxygen-poor blood into the right atrium?

Superior and inferior vena cava

Which structure directly reduces friction during heart movement?

Pericardial fluid

Which layer of the heart wall is continuous with blood vessels?

Endocardium

The heart is located in the:

Mediastinum

The apex of the heart:

Points toward the left hip

The pericardium functions to:

Prevent friction and overfilling

Which layer produces pericardial fluid?

Parietal serous layer

The visceral pericardium is also called:

Epicardium

Which layer is responsible for contraction?

Myocardium

The endocardium:

Lines chambers and valves

Which chambers receive blood?

Atria

Auricles function to:

Increase atrial volume

The interventricular septum separates:

Ventricles

Pectinate muscles are found in:

Atria and auricles

Trabeculae carneae are located in:

Ventricles

The tricuspid valve has:

3 cusps

The mitral valve is also called:

Bicuspid

Chordae tendineae attach valves to:

Papillary muscles

Semilunar valves control flow:

Into great arteries

During diastole:

Ventricles fill with blood

During systole:

Blood is ejected

Coronary circulation supplies:

Myocardium

Myocardial infarction is caused by:

Blocked coronary blood flow

Intercalated discs allow:

Electrical communication

Cardiac muscle primarily uses:

Aerobic respiration

The pacemaker of the heart is the:

SA node

The AV node delay allows:

Ventricles to fill

Purkinje fibers cause:

Ventricular contraction

Normal resting heart rate is:

70–80 bpm

Tachycardia is:

HR > 100

Bradycardia is:

HR < 60