transport in cells

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diffusion definition

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<p>a net movement of particles from an area of high to low concentration</p>

a net movement of particles from an area of high to low concentration

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diffusion factots

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<p>different concentrations</p><p>temperature</p><p>surface area</p>

different concentrations

temperature

surface area

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19 Terms

1
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diffusion definition

a net movement of particles from an area of high to low concentration

<p>a net movement of particles from an area of high to low concentration</p>
2
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diffusion factots

different concentrations

temperature

surface area

<p>different concentrations</p><p>temperature</p><p>surface area</p>
3
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small intestine role

most absorption of digested food molecules into the bloodstream occurs across the wall of the small intestine

<p>most absorption of digested food molecules into the bloodstream occurs across the wall of the small intestine</p>
4
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small intestine adaptations

highly folded SA, lined with specialised epithelial cells, increasing SA

one layer of epithelial cells covers the surface of each villus, decreasing diffusion distance

each villus has a good blood supply, maintaing a concentration gradient

<p>highly folded SA, lined with specialised epithelial cells, increasing SA</p><p>one layer of epithelial cells covers the surface of each villus, decreasing diffusion distance</p><p>each villus has a good blood supply, maintaing a concentration gradient</p>
5
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lungs role

gas exchange between air in the alveoli and the blood, to supply cells with oxygen for aerobic respiration and to remove carbon dioxide

<p>gas exchange between air in the alveoli and the blood, to supply cells with oxygen for aerobic respiration and to remove carbon dioxide</p>
6
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lungs adaptations

millions of alveoli, which collectively provide a huge surface area, increasing SA

the wall if each alveolus is one cell thick with a moist lining and excellent blood supply, maintain a concentration gradient

<p>millions of alveoli, which collectively provide a huge surface area, increasing SA</p><p>the wall if each alveolus is one cell thick with a moist lining and excellent blood supply, maintain a concentration gradient</p>
7
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gills role

gas exchange between water flowing through the gills and the blood, to supply cells with oxygen for aerobic respiration and to remove the waste product co2

<p>gas exchange between water flowing through the gills and the blood, to supply cells with oxygen for aerobic respiration and to remove the waste product co2</p>
8
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gills adaptations

made from lots of smaller plates called filaments, which themselves are covered in projections called lamellae, increasing SA

dense capillary network ensures a good supply flows in the opposite direction to water passing through gills, maintaining a concentration gradient

<p>made from lots of smaller plates called filaments, which themselves are covered in projections called lamellae, increasing SA</p><p>dense capillary network ensures a good supply flows in the opposite direction to water passing through gills, maintaining a concentration gradient</p>
9
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roots role

to absorb water and mineral ions from the soil and anchor the plant

<p>to absorb water and mineral ions from the soil and anchor the plant</p>
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roots adaptations

network is highly branched, increasing SA

the surface of roots are covered in root hair cells which have a specialised structure with root hair projections, increasing SA

<p>network is highly branched, increasing SA</p><p>the surface of roots are covered in root hair cells which have a specialised structure with root hair projections, increasing SA</p>
11
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leaves role

contain most of a plants photosynthetic plants

<p>contain most of a plants photosynthetic plants</p>
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leaves adaptions

stomata are tiny openings that predominantly cover the lower side of the leaf allowing air to circulate inside the leaf, decreasing diffusion distance

<p>stomata are tiny openings that predominantly cover the lower side of the leaf allowing air to circulate inside the leaf, decreasing diffusion distance</p>
13
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osmosis definition

the net movement of water molecules from a dilute to concentrated solution through a partially permeable membrane

<p>the net movement of water molecules from a dilute to concentrated solution through a partially permeable membrane</p>
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dilute

a solution with a high concentration of water

<p>a solution with a high concentration of water</p>
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concentrated

a solution with a low concentration of water

<p>a solution with a low concentration of water</p>
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osmosis RP aim

to investigate the range of concentrations of salt or sugar solutions on the mass of plant tissue

<p>to investigate the range of concentrations of salt or sugar solutions on the mass of plant tissue</p>
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osmosis RP method

prepare samples of potatoes and place in different concentrations of sugar solutions

make measurements of mass and length of samples before and after soaking them in solutions

calculate the percentage change in mass

plot and draw graphs

<p>prepare samples of potatoes and place in different concentrations of sugar solutions</p><p>make measurements of mass and length of samples before and after soaking them in solutions</p><p>calculate the percentage change in mass</p><p>plot and draw graphs</p>
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osmosis RP variables

independent: concentration of sugar solution

dependent: mass and length of potato before and after

control: temperature, time

<p>independent: concentration of sugar solution</p><p>dependent: mass and length of potato before and after</p><p>control: temperature, time</p>
19
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active transport definition

the movement of substances across a cell membrane from an area of low to high concentration

<p>the movement of substances across a cell membrane from an area of low to high concentration</p>