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31 Cards in this Set

  • Front
  • Back
what do blood vessels do?

transport substances around the body
name the three types of blood vessels


arteries




capillaries




veins


what do arteries do?

carry blood from the heart to the rest of the body

describe the walls of an artery


thick




muscular




elastic tissue


why are arteries muscular?

to cope with high pressure

what allows the artery to expand?

the inner lining is folded to help cope with high pressure

what artery does not carry oxygenated blood?

pulmonary artery

what do arteries branch into?

capillaries

what happens in capillaries?

glucose and oxygen etc are exchanged between cells and capilaries
what do capillaries connect to?

veins

what do veins do?

take blood back to the heart under low pressure

describe a vein


wider




little elastic




muscular tissue


what do veins contain?

valves

what helps the flow of blood through veins?

contraction of muscle surrounding them

what veins do not carry deoxygenated blood?

pulmonary veins

what is tissue fluid formed from?

blood

what do cells do with tissue fluid?


take in oxygen and nutrients




release waste into it

what is a capillary bed?

network of capillaries in an area of tissue

how do substances move out of capillaries?

pressure filtration

how is fluid forced out?

high pressure near the artery forces fluid out
what happens in pressure filtration as fluid leaves?

the pressure reduces

why does water re-enter the capillaries?

the pressure is lower then in the tissue fluid




water re-enters down the water potential gradient

where does excess tissue fluid drain?

into lymph vessels

what happens to the excess tissue fluid?

gets returned to the blood through the lymphatic system

what are the smallest lymph vessels?

lymph capillaries

what is lymph?

excess tissue fluid inside the lymph system

what stops lymph going backwards?

valves

where does the lymph head to?

main lymph vessels in the thorax

what is in blood?


rbc




wbc




platlets




protein




water




dissolved substances


what is in tissue fluid?


very few WBC




very few proteins




water




dissolved substances


what is in lymph?


wbc




only antibodies




water




dissolved substances