week 5 cardiac Flashcards
what do these three tissues compose- epicardium - outer
myocardium- middle muscle - endo cardium - inner
the heart wall
damage to the heart muscle caused by loss of blood means a block in what
arteries
blockages result in what
damaged cells
exercise training protects the heart against what
MI - heart attack - myocardial infarction
blood comes from where
superior vena cava
myocardium helps with muscle contraction of
the heart
which is the first valve before on right side
tricuspid
myocardium has what type of tissue
connective
what does the myocardium do
provides muscular contractions that eject blood from the chamber
what does the epicardium do
serves as lubricates outer covering
what does the endocardium do
serves as a protective inner lining of chambers and valves
disks in the heart allows what
cardiac muscle together
heart muscle has what kind of nuclei
single
heart muscle fibres are shorter and branched why
smoother movement for heart beat
what type of energy does the heart use
aerobic
where does the calcium come from
sarcoplasmic reticulum and extracellular
electrical contraction depend on what
stimulation of the myocardium
Sa node initiates what
depolarization
AV node does what
passes depolarization to ventricles - allowing V filling
what do bundle branches do
connect atria left and right too bundle of his
what do purkinje fibres do
spread a wave of depolarization throughout the ventricles
what is the T wave in ecg
ventricular repolarization
what is the p wave in the ecg
atrial depolarization
what is the QRS
ventricular depolarization and atrial repolarization
