they have a large surface area to volume ration, they are thin short diffusion pathway, capillary netweok allow concentrarion gradient and are moist so allowd gasses to disslive
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what happens when you breath in
the intercostal muscles contract, the ribs move up and out the diaragm flattens and volume increases
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what happens when you breath in
the ris move down and in the intercosatl muscles relax, the diagrma relaxes and volume decreases
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what is surrounding lungs
pleural fluid it acts as a lubricant and it prevents the alveouls form collapsing, the surfacnt fluid reduces surface tension
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plant is specialised for diffusion
leaf has large surgace are as it isthin and flat, spingey mesophyl circulate gases
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adaptations of the leaf
the leaf has large SA so it can cpature as much sunlight, it can orientate in direction of sun to capture as much sunlight, think so the sunlight can penertrate lower cells, palaside cells are apcked with chlorplastss
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what are the stomata
the stomata have smalls pores ion the underside of the leaf and are bounded by two guard cells and allow diffusiin of gases from te atmospher to the cells
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what do the guard cells contain to ston water loss
waxy cuticle
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opening closing mechanisism in stomata
the guard cells open to allw gas ecchange but they also loose water in doing so, the open in the day and close in the night . the gaurd cells are turgid then the gaurd cells openm if the faurd clls are flacid then the guard cells close
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theories of of why it happens
epidermal cells actively transpotr K+ ions into stomata, starch is stored as malate,and the stomata has a low water potentail so the water enters y osmosis
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what are xerophytes
planst that are living in exteme conditions with loss of water
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Other cards in this set
Card 2
Front
what happens when you breath in
Back
the intercostal muscles contract, the ribs move up and out the diaragm flattens and volume increases
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