Human Phys Heart

tricuspid valve

prevents backflow of blood; sits between right atrium and ventricle

pulmonary veins

collects blood returning to the heart from the lungs

interventricular septum

wall located between right and let ventricles

pulmonary trunk

pumps blood into the pulmonary artery

aortic semilunar valve

prevents the backflow of blood; sits between the left ventricle and the aorta

inferior vena cava

brings blood back to the heart from the lower parts of the body

right atrium

chamber of the heart that receives deoxygenated blood from the body systems

bicuspid valve

heart valve that prevents the backflow of blood into the left atrium

aorta

the major artery exiting the left ventricle that carries oxygenated blood to the body

pulminary artery

the artery that carries deoxygenated blood from the right ventricle to the lungs

right ventricle

chamber of the heart that pumps blood to the lungs

pulminary semilunar valve

heart valve that opens to allow blood to flow to the lungs

pulminary veins

veins connected to the heart that return oxygenated blood to the left atrium

apex

point on the inferior surface of the heart

base

area at the superior surface of the heart where all of the large blood vessels are attached

tricuspid valve

heart valve that opens to allow blood to flow into the right ventricle

superior vena cava

vein that carries deoxygenated blood from the upper body to the heart

chordae tendinae

fibrous cords that help to keep the valves closed during contraction.

left ventricle

the chamber of the heart that receives oxygenated blood from the left atrium and pumps it into the aorta

left atrium

the chamber of the heart that receives oxygenated blood from the pulmonary veins and passes it to the left ventricle

AV node

hold signals so it can reach atrium before contraction

purkinje fibers

tells ventricle to contract

SA node

“pacemaker”, starts every beat, sends P wave

AV bundle

gets signal to bottom of heart as fast as possible

bundle branches

splits signal to reach both sides of the ventricles quickly.

why do the purkiinje fibers start at the apex of the heart and then travel up the walls of the ventricles

the heart contracts bottom to top

diastole

relaxed

systole

contracts

stages of heart beat

1. mid to late diastole

2. ventricular systole

3. early diastile

mid-to-late diastole

atria contracts

ventricular systole

ventricles contracting

early diastile

everything is relaxed

P wave

QRS complex

T wave

P wave

atria depolarizes/contracts

QRS complex

venticles depolarize/contract

T wave

ventricles repolarize

PVC

PVC

premature ventricle contraction

sinus tachycardia

sinus tachycardia

resting heartbeat is too fast

sinus bradycardia

sinus bradycardia

resting heartbeat is too slow

atrial flutter

atrial flutter

atria contracts too often, QRS is normal

atrial fibrillation

atria fibrillation

atrias contract too often, QRS not spaced evenly

ventricular fibbrillation

ventricular fibrillation

ventricles are not contracting, most dangerous

myocardial infarct

death of heart tissue due to heart attack

full thickness infarct

vessell that’s blocked gives blocks lots of blood

partial thickness infarct

vessell that’s blocked blocks off little blood

15 minutes into heart attack

dizziness

20 minutes into heart attack

500 heart cells die/sec

what pain do you feel when having a heart attack

indegestion, arm pain, jaw pain

1

aorta

2

pulminary trunk/arteries

3 (poking out)

pulminary veins

4 (top to bottom)

right atrium, tricuspid valve, chordae tendinae, right ventricle

5

apex and interventricular septum

3 (big area) (top to bottom)

left atrium, bicuspid valve, chordae tendinae, left ventricle

path of deoxygenated blood from body

into heart from superior/inferior vena cava, into right atrium, through tricuspid valve, into right ventricle, opens pulmonary semilunar valve, to the lungs through pulmonary arteries, oxygenated, back to heart through pulmonary veins, through bicuspid valve, into left ventricle, opens aortic semilunar valve, through aorta out the heart

chambers of heart

right/left atrium and ventricles

valves of heart

tricuspid and bicuspid valves, aortic semilunar valve, pulmonary semilunar valve

vessels of heart

inferior/superior vena cava, aorta, pulmonary arteries/veins

veins

carry blood to heart

arteries

carry blood away from heart

1

SA node

2

Av node

3

bundle branches

7

purkinje fibers

6

AV bundle