Heart
what does the heart do
Designed for transportation and communication, circulates oxygen and blood around
4 chambers of the heart
R and L atrium, R and L ventricle
what are the 3 layers of the heart from superficial to deep
epicardium, myocardium, endocardium
Cardiac Conduction vs Cardiac Muscle
Cardiac Conduction- non contractile, nervous tissue conducting signals
Cardiac Muscle- Contractive
Veins vs Arteries
Veins- carries deoxygenated blood back to the heart
arteries- carries oxygenated blood away from the heart
S1
closure of AV valves, "lub" sound
4 valves
Tricuspid, mitral, pulmonary, aortic
tissue layers within blood vessels
Tunica Adventitia, Tunica Media, Tunica Intima
What is the Sinoatrial Node
sends signals causing heartbeat rythem, pace maker
What are cornorary arteries
on top of the heart, supplys heart itself with oxygen, where heart attack can occur
S2
closure of semilunar valves, "dub" sound
what happens when AV valves are open
ventricles are filling, atria is contracting
Chordae Tendinae
Tendon like strands attached to tissue flaps, allows valve to open and close preventing backflow
what does the bundle of His do
transmits signal faster
what are capillaries
where arterys and veins meet, where respiration occurs
effects of aging
increased ridged of vessels from decreased elasticity
Contraction + Relaxation
Systole, Diastole
What is the pericardium?
a sac that protects the heart
Order of waves
P wave
QRS complex
T wave
smallest artery
arterioles
abnormal heart sounds
gallops, rubs, murmurs
Semi lunar and AV
semilunar- pulmonary and aortic, prevents backflow during diastole
AV- tricupsid + mitral
what does Ischemia mean?
reversible cell injury
flow of electrical state
SA, AV, Bundle of His, L + R bundle branches, Porkinje Fibers
pulmonary artery vs pulmonary vein
pulmonary artery- only artery carrying deoxygenated blood
pulmonary vein- carries oxygenated blood