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biology > blood > Flashcards

blood Flashcards

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1
Q

what do white blood cells do?

A

help protect the body against infection

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2
Q

which are bigger red or white blood cells?

A

white blood cells

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3
Q

what do red blood cells contain that binds oxygen to transport it from the lungs to the tissues?

A

haemoglobin

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4
Q

what are platelets?

A

they are cell fragments that start clotting process at wound sites

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5
Q

what do plasma’s do?

A

has blood cells suspended in it and transports proteins & other chemicals around the body

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6
Q

red blood cells have no______ which makes space for___

A

nucleus

haemoglobin

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7
Q

what do arteries do?

A

carry blood away from the heart

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8
Q

what do the veins do?

A

carry blood back to the heart

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9
Q

what do valves?

A

prevent backflow ensuring that blood flows in the right direction

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10
Q

what are the main types of blood vessels?

A

arteries, veins, capillaries

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11
Q

how many chambers does the heart have?

A

4

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11
Q

how many chambers does the heart have?

A

4

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12
Q

what is the heart?

A

an organ that pumps blood around the body

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13
Q

what are stents?

A

can be used to keep narrowed or blocked arteries open

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14
Q

what do statins do?

A

reduce cholesterol levels in the blood, reducing the risk of coronary heart disease

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15
Q

what do ventricles do?

A

pump blood out of the heart

16
Q

what do aorta do?

A

carries oxygenated blood around the body

17
Q

what do pulmonary veins do?

A

brings oxygenated blood from the lungs

18
Q

what does the vena cava do?

A

brings oxygenated blood into the heart

19
Q

what does the pulmonary artery do?

A

takes deoxygenated blood to the lungs

20
Q

explain how arteries are adapted to perform their function

A

the walls contain thick layers of muscle to make them strong and elastic fibres to allow them to stretch and spring back

21
Q

name the blood vessel that has valves

A

vein

22
Q

why are the walls of the capillaries only one cell thick?

A

they carry blood close to the cells to exchange substances and having thin walls increases the rate at which substances can diffuse across them by decreasing the distance over which diffusion occurs

23
Q

what are artificial pacemakers

A

are electrical devices used to correct irregularities in the heart rhythm

24
Q

why are artificial hearts used?

A

to keep patients alive while they wait for a transplant or for their heart to rest as an aid to recovery

biology (6 decks)

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