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Biology AS
Unit 1…read more

Slide 2

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Topic Overview
Structure of the Heart Blood Pressure
Arteries and Veins Carbohydrate Structure
The Cardiac Cycle Lipids
Atherosclerosis Energy Budget
Estimating Risk Cholesterol
Identifying Health Risks Caffeine affecting heart
Prevention and rate
Treatment of CVD Vitamin C…read more

Slide 3

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Structure of the Heart
Learn the names of the
different valves, arteries
and veins for the exam.
Also known as
Atrioventricular valve.…read more

Slide 4

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Arteries and Veins
Arteries: Veins
Narrow lumen Wide lumen
Thick muscular walls with elastic Thinner walls
fibres Less collagen
More collagen Has valves to stop backflow
Smooth muscle Pumps deoxygenated blood to
No valves the heart
Pumps oxygenated blood to the Blood at low pressure
Blood at high pressure…read more

Slide 5

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Every time the heart contracts, blood is forced into
arteries and their elastic wall stretch to accommodate
the blood.
When the heart relaxes, the elasticity of the artery
walls causes them to recoil behind the blood, helping
to push the blood forward.
The blood moves along the length of the artery as each
section sin series stretches to recoil in this way.…read more

Slide 6

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The heart has a less direct
effect on the flow of blood Valves preventing backflow
through the veins.
In the veins, blood flow is
assisted by the contraction
of skeletal muscles during
movement of limbs and
Backflow is prevented by
valves within the veins
The steady flow without
pulses of blood means that
the blood is under low
pressure in veins…read more

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