Ch 42

Question 0

Describe signal conductance in heart to stimulate both atria to contract & then both ventricles

Answer 0

SA node > AV node > Atria Systole > bundle branches > Purkinje fibers > Ventricles systole

Question 1

Where is the pacemaker of the heart located?

Answer 1

sino atrial (SA) node in the right atrium

Question 2

What is systole?

Answer 2

Contraction of heart

Question 3

What is diastole?

Answer 3

Relaxation of heart

Question 4

Describe atherosclerosis

Answer 4

formation of plaque in blood vessels of heart or brain. Plaque occurs when cholesterol settles & accumulates underneath endothelium of arteries/arterioles causing blood flow blockage. cause of heart attack or stroke depends on numbers & location of blockage

Question 5

Describe 3 most important steps in formation of blood clot

Answer 5

1. Platelets adhere to damaged blood vessel
2. Prothrombin is activated to Thrombin
3. Thrombin removes amino acids from fibrinogen to form fibrin

Question 6

What is the function of the tricuspid & mitral valves?

Answer 6

• tricuspid valve prevents backflow of blood into right atrium
• mitral valve prevents backflow of blood into left atrium

Question 7

What is the function of the pulmonary & aorta semilunar valves?

Answer 7

• pulmonary SLV prevents backflow of blood to right ventricle
• aorta SLV prevents backflow of blood to the left ventricle

Question 8

what make the second heart beat sound dup?

Answer 8

The closing of the SLV valves

Question 9

Which blood vessel has the highest content of Oxygen?

Answer 9

Pulmonary venules & pulmonary veins

Question 10

Which chambers of the heart receive blood & which blood vessels enter them?

Answer 10

• atria receives blood
• Right atrium receives deoxygenated blood from vena cava
• Left atrium receives oxygenated blood from pulmonary veins

Question 11

Which chambers of the heart send blood & which blood vessels leave the heart from them?

Answer 11

• ventricles send blood
• Right ventricle send deoxygenated blood to pulmonary trunk, which sends it to the pulmonary circut
• Left ventricle send oxygenated blood to aorta, which send it to the systemic circut

Question 12

Right side of the heart carries (oxygenated or deoxygenated) blood?

Answer 12

deoxygenated

Question 13

left side of the heart carries (oxygenated or deoxygenated) blood?

Answer 13

oxygenated