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biology -blood , blood vessels and the heart b2 Flashcards

(8 cards)

1
Q

artery (blood vessel)

A

-carries blood AWAY from heart
-insides are narrow lumins to maintain high pressure
-thick elastic and muscular fibers to withstand high pressure

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2
Q

capillary (blood vessel)

A

-one cell thick -short distance for diffusion
-carbon dioxide diffuses in
-oxygen diffuses out
-narrow tube only allows one red blood cell

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3
Q

veins ( blood vessels)

A

-thin elastic and muscular fibers due to low pressure -wide lumin to increase blood flow due to narrow pressure
-valves preventing blood flowing in the wrong direction
-valves can close
-veins take blood BACK to the heart

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4
Q

red blood cells

A

-no nucleus
-contains haemoglobin which carries the oxygen
-bioconcaved shape to increase surface area so diffusion can happen faster

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5
Q

white blood cells

A

-fight infection
-lymphocytes- produce antibodies and antioxidants
-phagocyte- surrounds and engulfs pathogens

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6
Q

platelets

A

-cause blood to clot
-small fragments of cells
-no nucleus

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7
Q

plasma

A

-the liquid part of blood
-carries both useful and waste substances
-yellow/ straw colour

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8
Q

]

A
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