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
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
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
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