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plants chap 13 end
| Question | Answer |
|---|---|
| the differnce in structure of each blood vessel if related.. to difference in function. | |
| how to arterioles differ from arteries? larger muscle and lumen. smaller in diameter. | |
| if blood flows away from heart valves? valves are pushed closed - prevent backflow. | |
| flow of blood in capillaries much slower? to allow time for exchange of materials. | |
| What is tissue fluid made of? Watery fluid with glucose, aminoA, fattyA and oxygen. | |
| who is tissue fluid formed? blood plasma & composition of blood plasma- controlled by homeostatic systems.- provides constant enviroment for cells. | |
| formation of tissue fluids - what is hydrostatic pressure? blood pumped by heart passed along ten arteries , narrower arterioles then capillaries. | |
| where is hydrostatic pressure? at arterial end of the cappilaries. | |
| what does hydrostatic pressure do? it forces tissue fluid out of blood plasma. | |
| what 2 forces oppose hydrostatic pressure? hydrostatic presure of tissue fluid outside capillries - prevent outwards movement of liquid. lower WP of blood due to plasma proteins - that pull water back.into blood within capillaries. | |
| what do plasma proteins do? pulls water back into blood within cappillaries. | |
| what is the combined effort of 2 forces opposing outward preesure of hydrostatic pressure? | to create an overall pressure that pushes tissue fluid out of capillaries. pressure only enpugh to force small molecules out of capillaries. type of filtration: ultrafiltration. |
| Return of tissue fluid to circulatory system? once tissue fluid exchanged metabolic material with cells- must return to circulatory system. fluid return to blood plasma via capillaries. | |
| the loss of fluid from capillaries..? | eeduces hydrostatic pressure in them. so when blood reqches venous end of cappilary network its hydrostatic pressure is less than OUTSIDE . so TISSUE forced back into capillaries by HIGHER HYDROSTATIC PRESSURE OUTSIDE THEM. |
| due to the cells it bathes? tissue fluid lost much oxygen ,nutrients, by diffusion into cells it bathe. gains CO2 and waste materials . | |
| because not all tissue fluid can return back to cappilaries? remainder is carried back via lymphatic system . | |
| what is the lymphatic system? system of vessels that begin in tissues. they form into LARGE vessels that network around body . | |
| How are the contents of lymphatic system moved? hydrostatic pressure of tissue fluids. contraction of body muscle - that squeeze lympth vessel - VALVES in lymth ensure fluid moves from tissue to heart. | |
| Why do plants need to conserve water? terestrial organisms - have water proof layer | |
| the osmotic force due to... protein in blood plasma - pull water back into capilaries. the osmotic force due to protein in blood plasma - pull water back into capilaries. | |
| capillaries cannot serve every cell directly so.... final metbolic material made of tissue fluid. |
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ufuoma
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