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Lecture 1

Kinesiology 2230A/B Lecture Notes - Lecture 1: Superior Vena Cava, Atrioventricular Node, Coronary Circulation

Course Code
Kinesiology 2230A/B
Glen Belfry

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CV Lecture 1
Blood volume at rest - 5L
VO2 of brain can double during cerebral activity
Arteries are resistance vessels
o Change diameter quickly
Veins are capacitance vessels
o Side where most blood is stored at rest (64%)
Cardiac Structure and Function - Fick Equation
VO2 = HR x SV x (a-VO2diff)
o Heart - HR x SV
o Tissue - a-VO2diff
A-VO2 difference and how much O2 is being delivered determines O2 consumption
o If a-VO2 difference is greater, O2 consumption will increase
The Heart - Internal vs. External
Venous circulation - blood returns to the heart via inferior and superior vena cava - right atrium -
right ventricle - right and left pulmonary arteries - aorta - systemic circulation
Right side - to lungs
Left side - rest of body
Arteries - blood away from the heart
Veins - towards the heart
Major Arteries
Right and left coronary arteries
Circumflex artery
Anterior and posterior interventricular arteries
Initiation of Heart Contraction and Relaxation
SA node:
o Cluster of cells that depolarize spontaneously and generate electric current
o No external stimulus
o Wave of depolarization from SA node to atria to muscle contraction
o Goes to AV node next
AV node:
o Cluster of cells at the barrier of the atrium and ventricle
o Functions to slow the movement of the depolarization wave from the atrium into the
o Mostly lipid and doesn’t conduct
o Enables to completely depolarize atria before ventricles
o Small delay
Bundle of His and Purkinje Fibres:
o Bundle branches allow the whole heart to receive the depolarization wave quickly
o Synchronous contraction of ventricles
o Depolarization wave moves through these and myocardium
Phases of a Resting ECG
P - atrial depolarization
AV node - delay
QRS - initial depolarization moving through the septum
o Ventricle depolarization
T - ventricular repolarization after ventricular contraction
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