Heart

Question 1

what do the right + left side do + what seperates them
(internal structure)

Answer 1

right: pumps to the lungs
left: pumps to the body
right + left side are separated by septum

Question 2

describe AV + SV
(internal structure)

Answer 2

• each side has an atrium and ventricle, and they are separated by an atrioventricular valve (AV)
• valves are also present at the “exit” of the ventricles, called semilunar valves (SV)

Question 3

describe external structure: coronary arteries + pericardium

Answer 3

• coronary arteries and veins supply blood to the heart muscle
• the pericardium is a fluid-filled sac that surrounds the heart

Question 4

describe heart electricity: SA

Answer 4

SA node:
- Sinoatrial node
- hearts pacemaker

Question 5

describe heart electricity: AV

Answer 5

AV node:
- atrioventricular node
- stimulates His bundle and Purkinje fibers
- causes ventricular contraction

Question 6

cardiac cycle vocab

Answer 6

occurs simultaneously on the left and right sides
diastole: relaxed
systole: contracted

Question 7

cardiac cycle

Answer 7

1) diastole: AV valves are open, and blood flows atrium to ventricle
2) atrial systole: the SA node sends an impulse triggering the atria to contract
3) ventricular systole: when the electricity reaches the AV node, it sends a signal through the ventricular muscle to cause it to contract. the AV valves close and blood is pushes out of the ventricles
4) ventricular diastole: the ventricles relax, semilunar valves close, the AV valves open, and the cycle restarts

Question 8

what is lub-dub

Answer 8

sound the heart makes: sound made by the valves closing
lub: AV valves closing
dub: SL valves closing

Question 9

what is arrhythmia

Answer 9

irregular heartbeat
- tachycardias: too fast
- bradycardias: too slow

Question 10

see notes for electrocardiograms