biology - the need for energy.

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how is energy released from food?
energy is released from food by a process called respiration
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what is needed for respiration?
oxygen
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what are the waste products of respiration?
carbon dioxide and water
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Describe the air sacs (alveoli)
a very large total surface area and a very good blood supply
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What are the four chambers of the heart?
right atrium, right ventricle, left atrium and left ventricle
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What are the function of valves?
to stop backflow of blood
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Why is the wall of the left ventricle much thicker than the right?
because it has to pump blood around the whole body the right ventricle only pumps to the lungs
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Where does the heart get its supply of blood from?
coronary arteries
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What are the three main types of blood vessel?
arteries, capillaries, veins
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What is the function of the arteries?
take blood away from the heart to the body organs and tissues
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What is the function of the capillaries?
form a network to take blood through the organsand tissues
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What is the function of the veins?
collect blood from the capillaries in the body and return the blood to heart
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In what blood vessel can you feel a pulse?
in the arteries
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What is the function of plasma(blood)?
carries dissolved carbon dioxide and food
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What is the function of red blood cells?
collect oxygen in the lungs and carry it round the body
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What is the function of white blood cells?
fight infections
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What is the function of platelets?
help blood to clot where there has been a cut
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What do red blood cells contain?
Haemoglobin
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What is the function of Haemoglobin ?
combines with oxygen in the lungs to form a bright red chemical called oxyhaemoglobin
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Where does most of the gas exchange in the body take place?
Capillaries
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How are capillary networks well adapted to exchanging substance with body cells?
capillaries have very thin walls which let gases diffuse in or out quickly every cell has capillaries passing very close to it so there is a short diffusion path there is a huge length of capillariesgiving lots of surface area through which diffusion
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Other cards in this set

Card 2

Front

what is needed for respiration?

Back

oxygen

Card 3

Front

what are the waste products of respiration?

Back

Preview of the front of card 3

Card 4

Front

Describe the air sacs (alveoli)

Back

Preview of the front of card 4

Card 5

Front

What are the four chambers of the heart?

Back

Preview of the front of card 5
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