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study guide

6 Pages
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Department
Biological Sciences
Course Code
BIOC34H3
Professor
Stephen Reid

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Lecture 3 & 4 Study Notes
1 2 3 4 5
* Phase 1: [Diastole period] Mid-Late Diastole: Ventricular filling
Pressure in RA/LA > Pressure in RV/LV i.e. pressure in atria is greater than in
ventricles
Volume in RV increasing (mostly due to passive filling)
Passive filling (90%) more than due to atrial depolarisation (10%)
Respective atrioventricular valve open (Right side = Tricuspid valve; Left side =
Bicuspid valve)
Passive flow of blood into aorta :
oAorta acts as pressure reservoir
*Phase 2: [Systole period] Isovolumetric Contraction:
no blood movement, ventricular volume remains constant as ALL valves closed
Pressure in RV/LV > Pressure in RA/LA, hence AV valve closed
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Pressure in respective pulmonary arteries/aorta > Pressure in RV/LV, hence
semilunar valves closed
Passive flow of blood into aorta due to aortic pressure > ventricular pressure
oAorta acts as pressure reservoir
Aortic pressure is at minimum here (gives diastolic pressure 80 mmHg)
*Phase 3: [Systole period] Ventricular Ejection
Pressure in LV/RV > Pressure in Aorta/Pulmonary arteries , causing emptying of
ventriles
Respective Semilunar valve open
Volume in ventricles decreases
Aortic pressure reaches maximum here (gives systolic pressure 120 mmHg)
*Phase 4: [Early Diastole period] Isovolumetric Relaxation:
Constant blood volume again in ventricles
Dichrotic notch: small hike in Aortic pressure due to aortic valve closure
Pressure in Aorta/Pulmonary arteries > Pressure in LV/RV
*Back to Phase 1
Cardiac cycle time allocation
Diastole: 65% of the time
Systole: 35% of the time
Right Atrium to Right Ventricle
Tricuspid valve separate the right atrium from the right ventricle
oWhen pressure in RA > pressure in RV, the Tricuspid valve opens,
allowing for ventricular filling
oBlood, however, passes more passively into ventricle than due to atrial
depolarisation (Small jump is due to depolarisation)
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Description
Lecture 3 & 4 Study Notes 1 2 3 4 5 * Phase 1: [Diastole period] Mid-Late Diastole: Ventricular filling Pressure in RALA > Pressure in RVLV i.e. pressure in atria is greater than in ventricles Volume in RV increasing (mostly due to passive filling) Passive filling (90%) more than due to atrial depolarisation (10%) Respective atrioventricular valve open (Right side = Tricuspid valve; Left side = Bicuspid valve) Passive flow of blood into aorta: o Aorta acts as pressure reservoir *Phase 2: [Systole period] Isovolumetric Contraction: no blood movement, ventricular volume remains constant as ALL valves closed Pressure in RVLV > Pressure in RALA, hence AV valve closed www.notesolution.com
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