PHYS20008 Lecture Notes - Lecture 16: Tricuspid Valve, Measure (Mathematics), Turbulence
10 May 2018
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Lecture 16
- Heart is electrical organ, made up of cardiac muscle (excitable cells/ electrical cells),
need electrical conduction to move into heart to get it to beat, pump that moves stuff
around body
- Activity of heart is going to largely determine a very large proportion of what
determines overall blood pressure
- Heart with Infarction: had a heart attack, one of the vessels that runs along outside of
heart has been blocked or stop carrying blood → stop feeding muscle and muscle
tissue died; blood still moves through aorta
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- Left ventricle is the biggest one → pumps into systemic circulation with aorta coming
off of it; receive blood from pulmonary vein, fresh oxygenated blood coming in into
left ventricle and pumped out through aorta
- Right ventricle: receiving blood from systemic circulation, depleted blood and
pumping blood into lungs
- Between chambers and major blood vessels out are valves: ensure one way flow
through system
- Heart starts its contraction from the bottom and squeeze upwards → pushing blood
up and out through vessels
- Right ventricle normally has less muscle mass than the left ventricle and creates less
pressure when it contracts because pulmonary resistance is less than systemic
resistance
- Pulmonary circuit has less resistance (affected by length, width, and viscosity)
because: short length, low pressure
- If increase pressure in pulmonary circuit → get pulmonary oedema
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- Heart as a pump: either contracting or relaxing, forcing blood through system in
pulsating manner
- When heart is actively contracting: systole (contraction of chamber actively pushing
things through)
- When heart is relaxed: diastole
- Normal reading for blood pressure: 110/120 (systolic), 70/80 (diastolic),
- Systolic blood pressure: pressure in artery when heart is contracting and pushing
blood actively into artery
- Diastolic blood pressure: heart is relaxed
- Blood pressure is like a wave
- Sequence of flow:
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find more resources at oneclass.com
-
- Blood moves into atria (collecting chambers) → blood moves from atria into ventricles
(usually passive, at the end atrium get a little squeeze to make sure the rest of blood
gets down into ventricles) → ventricular systole ejects blood out into arteries
- Atria to contract first → ventricles fill → ventricles contract
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Heart is electrical organ, made up of cardiac muscle (excitable cells/ electrical cells), need electrical conduction to move into heart to get it to beat, pump that moves stuff around body. Activity of heart is going to largely determine a very large proportion of what determines overall blood pressure. Heart with infarction: had a heart attack, one of the vessels that runs along outside of heart has been blocked or stop carrying blood stop feeding muscle and muscle tissue died; blood still moves through aorta. Left ventricle is the biggest one pumps into systemic circulation with aorta coming off of it; receive blood from pulmonary vein, fresh oxygenated blood coming in into left ventricle and pumped out through aorta. Right ventricle: receiving blood from systemic circulation, depleted blood and pumping blood into lungs. Between chambers and major blood vessels out are valves: ensure one way flow through system.
