Vessels

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Arteries
Narrow lumen, thicker walls, more collagen, elastic fibres and smooth muscle, no valves.
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Veins
Wide lumen, thinner walls, less collagen, elastic fibres and smooth muscle, valves present.
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Walls of arteries and veins
Collagen, a tough fibrous protein; strong and durable, elastic fibres; stretch and recoil, smooth muscle; constrict and dilate.
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Blood through vessels
Systole(contracts) blood forced into arteries, elastic walls stretch. Diastole(relaxation) walls recoil to push blood forward. Blood reaches arteries and capillaries> steady flow.
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Capillaries
Join arteries and veins, very narrow, walls only one cell thick. Network of capillaries lies close to every cell, ensures rapid diffusion between blood and surrounding cells
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Flow of blood in veins
Veins blood flow assisted by contraction of skeletal muscles during movement of limbs and breathing. Low pressure in thorax> draws blood back into heart from veins. Steady flow without pulses> low pressure in veins. Valves prevent backflow.
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Heart as a muscle
Requires constant supply of fresh blood, heart unable to use blood inside chambers directly. Heart supplied by blood through coronary arteries.
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Other cards in this set

Card 2

Front

Wide lumen, thinner walls, less collagen, elastic fibres and smooth muscle, valves present.

Back

Veins

Card 3

Front

Collagen, a tough fibrous protein; strong and durable, elastic fibres; stretch and recoil, smooth muscle; constrict and dilate.

Back

Preview of the back of card 3

Card 4

Front

Systole(contracts) blood forced into arteries, elastic walls stretch. Diastole(relaxation) walls recoil to push blood forward. Blood reaches arteries and capillaries> steady flow.

Back

Preview of the back of card 4

Card 5

Front

Join arteries and veins, very narrow, walls only one cell thick. Network of capillaries lies close to every cell, ensures rapid diffusion between blood and surrounding cells

Back

Preview of the back of card 5
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