HLSC 1201U Chapter Notes -Heart Valve, Cardiac Muscle, Cardiac Output
Document Summary
Hemodynamics collection of mechanisms that influence the dynamic (active and changing) circulation of blood. The sa node is the pace maker, specialized pace maker cells within have an intrinsic. The heart as a pump: the heart muscle pumps the blood, needs to be organized by. Contraction (systole) and relaxation (diastole) of both atria and both ventricles contraction > 3. Ejection (blood gushes out of heart) > 4. Isovolumetric pressure: pressure in heart remains the same until pressure forces blood out (breaking point, high bp of 120, pressure of 121 and aortic valve opens, blood rushes out. Atrial systole: p wave triggers atrial contraction, increased pressure pushes blood out of atria into relaxed ventricles via open av valves valve closes (lub), sl valves stay closed wave) valves (dup), av remain closed filling (diastasis) Passive ventricular filling: ongoing diastole, av valves open; rapid filling reduced. Isovolumentric ventricular relaxation: onset of ventricular diastole, closure of the sl.
