Chapter 22 - The Heart

Question 1

in which direction do arteries move blood

Answer 1

away from heart

Question 2

in which direction do veins move blood

Answer 2

towards heart

Question 3

systemic circulation

Answer 3

all over body

Question 4

pulmonary circulation

Answer 4

oxygen, lungs

Question 5

what is the mediastinum

Answer 5

space where heart sits in

Question 6

which side is the heart mostly on

Answer 6

the left side

Question 7

what are the 2 layers of the pericardium

Answer 7

fibrous pericardium

serous pericardium

Question 8

what are the 2 layers of the serous pericardium

Answer 8

parietal pericardium

visceral pericardium

Question 9

what are the 3 layers of the heart wall

Answer 9

epicardium
myocardium
endocardium

Question 10

cardiac muscle

Answer 10

• 1-2 nuclei
• branched fibers
• mitochondria
• striated
• intercalated discs

Question 11

fibrous skeleton

Answer 11

prevents electrical activity from going from atria to ventricles

Question 12

what is cardiac cycle

Answer 12

contraction/relaxation phases of the heart

Question 13

what is systole

Answer 13

contraction of the heart

Question 14

what is diastole

Answer 14

relaxation of the heart

- during diastole a lot of blood flows through atria and begins to fill ventricles

Question 15

atria contract and ___ ventricles

Answer 15

“top off”

Question 16

ventricles contract, pumping blood through ___ valves into circulations

Answer 16

semilunar

Question 17

cardiac conduction system

Answer 17

sinoatrial node
atrioventricular node
bundle of His
bundle of branches
purkinje fibers

Question 18

what is an electrocardiogram (ECG, EKG)

Answer 18

record of electrical activity of heart

Question 19

QRS complex

Answer 19

bigger electrical current, ventricles are bigger

Question 20

T wave

Answer 20

ventricular repolarization