Cardiac muscle Physiology Flashcards
what usually causes the plateau on an ECG?
1-2
calcium ions
what does the P wave mean on an ECG?
1-4
it shows the aria contracting
what does the QRS complex mean on an ECG?
1-4
the ventricles depolarising and hyper polarising
what does the T wave mean on an ECG?
1-4
repolarisation of the ventricles
what happens when there is a rise in calcium ion in the CYTOPLASM?
1-8
actin and myosin activates
what is the sliding filament theory?
1-8
when filaments slide lover each other and generate mechanical force
what is the function on ryanodine receptors?
1-8
to amplify calcium release? in the cytoplasm?
where are L-type calcium ions mostly located?
1-8
tubules
where are ryanodine receptors located?
1-8
sarcoplasmic reticulum membrane
what is tetanus?
1-10
prolonged muscle contraction
what do large refractory period prevent?
1-12
tetanus
what is the length- tension relationship?
1-13
the more you stretch a muscle, the more it will contract
what is the length-tension relationship actually called?
1-14
frank-starling mechanism
name one example of an effect when one side of the heart pumps harder than the other (unusually)
1-16
- Pulmonary volume increases
- Increased pressure in pulmonary veins
- Left ventricular filling pressure increases
- Left ventricle becomes more distended (stretched)
- Increase in stroke volume
which side of the heart should be pumping harder the the other?
1-16
left ventricle should be pumping harder than the right ventricle
what is the unit called when actin and myosin overlap each other?
1-17
sarcomere
