Biology B3

Created by: xavedge
Created on: 17-01-17 20:43

define: osmosis

the net movement of water. from a high water concentration to a low water concentration across a partially permeable membrane

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Define: active transport

movement of moleculars across a partially permeable membrane. fromm a low to a high concentrtion against the gradient. it requires engery from respiration

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what things are moved through active transport

ions and gulcose ( sugars)

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Breathing in

intercoastal muscles contract, ribs move up and out, the diaphram flattens, volume of the thorax increases, prssure of the thorax decreases

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breathing out

intercoastal muscles relax, ribs move down and in, diaphram becomes doomed, the volume in the thorax decreases, the pressure in the thorax increases

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reasons why people cannot get enough oxygen into their bloodstream

damaged alveoli (surface area for gas exchange is reduced), if the tubes leading to the lungs are norrowed less air can then move through the, if a person is paralysed( their muscles will not work to pull the ribs up and out)

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different types of breathing aids

iron lung, positive pressure aid

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iron lung

used for people who are paralysed, the person lay on their chest and a large metal cylinder draws air out this forces the chest to go up and out, the vacuum which is formed in the cylinder creats a negative pressure.

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positive pressure sid

they force amounts of air into the lungs forcing them to contract and relax etc

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Other cards in this set

Card 2

Front

Define: active transport

Back

movement of moleculars across a partially permeable membrane. fromm a low to a high concentrtion against the gradient. it requires engery from respiration

Card 3

Front

what things are moved through active transport

Back

Card 4

Front

Breathing in

Back

Card 5

Front

breathing out

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Biology B3