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AIMS: INTRODUCTION TO CV SYSTEM
Objectives: ALL to understand:
Structure & function of the heart
Dual role of the heart
Blood flow through the heart
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THE CV SYSTEM: HEART & CIRCULATORY
(VASCULAR) SYSTEM
Muscular pump that beats continuously,
over 100,000 times per day
Combined with blood vessels (arteries,capillaries & veins)
it provides
tissues/cells with oxygen & nutrients
http://www.youtube.com/watch?v=TMdKp2zHgog&feature=youtu.be
http://www.youtube.com/watch?v=TMdKp2zHgog&feature=youtu.behttp://www.youtube.com/watch?v=TMdKp2zHgog&feature=youtu.behttp://www.youtube.com/watch?v=TMdKp2zHgog&feature=youtu.behttp://www.youtube.com/watch?v=TMdKp2zHgog&feature=youtu.be
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THE HEART
Located behind sternum/ribs which protect it
Size = about that of clenched fist in adults
Although training does increase size =
CARDIAC HYPERTROPHY
Heart consists of 4 chambers:
What are these?
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Pulse Rates Everyone's pulse changes as we age
Average pulse rates at different ages: Why?
Age Pulse
Newborn 130
3 months 140
6 months 130
1 year 120
2 years 115
3 years 100
4 years 100
6 years 100
8 years 90
12 years 85
Adult 60 - 100
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THE HEART
2 chambers at top (super ior) part of heart areatria
2 chambers at bottom (in fer ior) part areventricles
Also divided into left/right parts by SEPTUM(muscular
partition)
Shockwave
ACTIVITY 1: ADD FOLLOWING TO DIAGRAM OF HEART &DIRECTION OF
BLOODFLOW
(REMEMBER BACK TO FRONT) & THEN ANSWER QUESTIONSON BACK
Aorta Pulmonary vein & artery Lungs (not on diagrambut
identify direction from heart) Bicuspid & tricuspid valve
Left & right atria Left & right ventricles
http://library.med.utah.edu/kw/pharm/hyper_heart1.htmlhttp://library.med.utah.edu/kw/pharm/hyper_heart1.html
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ANSWERS
1. L side circulates oxygen rich blood throughbody/system i.e.
SYSTEMIC CIRCULATION
R side pumps oxygen poor blood to lungs for
re-oxygenation i.e. PULMONARYCIRCULATION
2. Valves ensure blood only flows one way
through heart & doesnt go backwards
3. Myocardium = cardiac muscle tissue
responsible for contracting heart & ejecting
blood
4. Coronary arteriesfeed heart with blood as
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RECAP
Complete quick quiz2 minutes
http://www.thesunblog.com/sports/questionmark.jpg
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http://www.thesunblog.com/sports/questionmark.jpg
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N XT L SSONHomework: Research
Conduction system: how heart works
SA & AV nodes
Bundle of His
Pukinje fibres
Cardiac cycle: systole & diastole
