Biology - Chapter 8:Heart and Circulation

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How is the shape of a red blood cell is related to its function

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How is the shape of a red blood cell is related to its function

It is biconcave shape for increased surface area

flexible to can flow through easily

no nucleus to carry more oxygen

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2

Explain why red blood cells cannot be stored in pure water

swell up and burst

lower water conc. inside than surroundings

water would diffuse inside and burst

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3

Artery

Transports blood away from heart

withstand high pressure

carry oxygenated blood

elastic fibres to help it stretch and recoil with each surge of blood

endothelium layer reduces friction

collagen - protection

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4

Vein

Transports blood to the heart

Carry deoxygenated Blood

have valves

thin walls

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5

Cardiac output

Volume of blood by heart into system in one minute

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6

Stroke volume

Volume of blood pumped each time left ventricle beats

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7

Leukocytes

digests and destroys pathogens also produce antibodies

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8

Erthocytes

Transports oxygen, removes carbon dioxide takes it to lungs to exhale

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9

Role of haemoglobin

bind to oxygen

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10

why can red blood cells not be stored in pure water

swell up and burst (lysis)

lower concentration of water molecules inside than outside it surroundings

water molecules differ inside

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11

Give one reason why the wall of the left ventricle is thicker than the right.

Need to pump blood throughout the whole body .

right only need to pump to lungs so shorter distance

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12
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