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Biology topic 1 (active transport (movement of substances down…
Biology topic 1
active transport
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villi: less food, AT used
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stem cells
embryonic
zygote divides, forms embro
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plant
found in meristem, tips of roots and shoots
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disadvantages
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adult - painful, can only become certain types of cell
osmosis
diffusion of water across a partially permeable membrane down concentration gradient - passive process, net movement
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more dilute outside = hypotonic - cells become turgid, burst
more concentrated outside, hypertonic - cells become flaccid
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diffusion
movement of particles in liquid or gas, moving down concentration gradient in a net movement. A passive process
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uses
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lungs - alveoli, hamoglobin, gas exchange
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stem cell uses
cure diseases i.e. paralysis, blindness, diabetes
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