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science > breathing and circulation > Flashcards

breathing and circulation Flashcards

1
Q

why is breathing important?

A

to bring into the body and gas exchange

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2
Q

where does gas exchange occur?

A

our lungs

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3
Q

where does air enter the body?

A

nose and mouth

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4
Q

what does the treachea do?

A

carries air into the body through branches called bronchi

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5
Q

what does bronchi do?

A

each bronchus brings air into a lung

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6
Q

what do bronchi do?

A

split into smaller branches called bronchioles which carry air to tiny air sacs called alveoli

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7
Q

when does breathing occur?

A

occurs as our diaphragm and rib muscles contract and relax

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8
Q

where is there more oxygen?

A

inhaled air

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9
Q

what does the circulatory system do?

A

transports heat and important substances around the body

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10
Q

what is blood made up of?

A

plasma, red blood cells, white blood cells and platelets

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11
Q

what is plasma?

A

liquid part of the blood and has many substances dissolved in it

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12
Q

what does red blood cells do?

A

carry oxygen around the body

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13
Q

what do white blood cells do?

A

fight infection and protecting us from disease

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14
Q

what are platelets important for?

A

forming blood clots

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15
Q

what are the 3 types of blood vessels?

A

arteries, veins and capillaries

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16
Q

what are arteries?

A

carry blood away from the heart and have think walls

17
Q

what do veins do?

A

carry blood to the heart and have thinner walls

18
Q

what do capillaries do?

A

very thin walls that allow substances to diffuse into and out of the blood

19
Q

what does the human heart do?

A

acts as a pump and serves a double circulation system

20
Q

what does the blood that is pumped from the right side of the heart do?

A

collect oxygen and get rid of carbon dioxide

21
Q

what does oxygen that is pumped from the left side of the heart do?

A

deliver oxygen to the body and collects carbon dioxide waste. it then returns to the heart once more

22
Q

what does each heartbeat cause?

A

a pulse

23
Q

where can a pulse be felt?

A

in the arteries

24
Q

what increases a heartbeat?

A

excersise

science (5 decks)

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