Chapter 20: Heart

Question 1

Wall of Heart

Answer 1

Epicardium (visceral pericardium)
Myocardium
Endocardium

Question 2

Atrioventricular valves (tricuspid valve, mitral valve)

Answer 2

prevent backflow from contracting ventricles to the atria.

Question 3

Semilunar valves (pulmonary valve, aortic valve)

Answer 3

open when ventricular pressure exceeds pressure in pulmonary trunk or aorta, close to prevent backflow from the arteries

Question 4

Systemic circulation:

Answer 4

Blood supply to all cells of the body except the air sacs of the lungs.

Question 5

Pulmonary circulation:

Answer 5

Blood supply to air sacs of the lungs only.

Question 6

Coronary circulation:

Answer 6

blood flow to myocardium (part of systemic circulation)

Question 7

Pacemaker of heart:

Answer 7

Sinoatrial node (SA node)

Question 8

Conduction system

Answer 8

Atrioventricular node (AV node)

Question 9

P wave, T wave, QRS complex:

Answer 9

atrial depolarization (p)
ventricular repolarization (t)
ventricular depolarization (qrs)

Question 10

Systole

Answer 10

contraction

Question 11

Diastole

Answer 11

relaxation

Question 12

Stroke Volume (SV)

Answer 12

the volume of blood ejected from a ventricle during systole

Question 13

Cardiac Output (CO)

Answer 13

the volume of blood pumped by a ventricle each minute

Question 14

CO= SV X heart rate

Answer 14

CO (ml/min) = SV (ml/beat) X heart rate (beats/min)

Question 15

Heart rate (HR) is adjusted by…

Answer 15

autonomic nervous system:
Parasympathetic (slows hr)
Sympathetic (raises hr)