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31 Cards in this Set
- Front
- Back
what do blood vessels do?
|
transport substances around the body |
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name the three types of blood vessels
|
capillaries veins |
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what do arteries do? |
carry blood from the heart to the rest of the body |
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describe the walls of an artery |
muscular elastic tissue |
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why are arteries muscular? |
to cope with high pressure |
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what allows the artery to expand? |
the inner lining is folded to help cope with high pressure |
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what artery does not carry oxygenated blood? |
pulmonary artery |
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what do arteries branch into? |
capillaries |
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what happens in capillaries? |
glucose and oxygen etc are exchanged between cells and capilaries |
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what do capillaries connect to?
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veins |
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what do veins do? |
take blood back to the heart under low pressure |
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describe a vein |
little elastic muscular tissue |
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what do veins contain? |
valves |
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what helps the flow of blood through veins? |
contraction of muscle surrounding them |
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what veins do not carry deoxygenated blood? |
pulmonary veins |
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what is tissue fluid formed from? |
blood |
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what do cells do with tissue fluid? |
release waste into it |
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what is a capillary bed?
|
network of capillaries in an area of tissue |
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how do substances move out of capillaries? |
pressure filtration |
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how is fluid forced out? |
high pressure near the artery forces fluid out |
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what happens in pressure filtration as fluid leaves?
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the pressure reduces |
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why does water re-enter the capillaries? |
the pressure is lower then in the tissue fluid water re-enters down the water potential gradient |
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where does excess tissue fluid drain?
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into lymph vessels |
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what happens to the excess tissue fluid? |
gets returned to the blood through the lymphatic system |
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what are the smallest lymph vessels? |
lymph capillaries |
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what is lymph? |
excess tissue fluid inside the lymph system |
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what stops lymph going backwards? |
valves |
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where does the lymph head to? |
main lymph vessels in the thorax |
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what is in blood? |
wbc platlets protein water dissolved substances |
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what is in tissue fluid? |
very few proteins water dissolved substances |
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what is in lymph? |
only antibodies water dissolved substances |