Exchange of materials - key words

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Osmosis
The net movement of water from an area of high concentration to low concentration along a concentration gradient
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Partially Permeable
Allowing only certain substances to pass through
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Active Transport
The movement of substances against a concentration gradient and/or across a cell membrane, using energy
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Dehydrated
lacking in water
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Rehydrated
To restore water to a system
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Isotonic
Having the same concentration of solutes as another solution
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Exchange surface
A surface where materials are exchanged
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Solute
The solid which dissolves in a solvent to form a solution
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Gaseous Exchange
The exchange of gases
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Alveoli
The tiny air sacs in the lungs which increase the surface area for gaseous exchange
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Ventilated
The movement of air into and out of the lungs
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Capillary
The smallest blood vessle that runs between individual cells. It has a wall that is only one cell thick
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Breathing System
The organ system involved in breathing: the ribs, intercostal muscles, diaphragm, the lungs and tubes which bring air into the body
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Diaphragm
A strong sheet of muscle that separates the thorax from the digestive organs, used to change the volume of the chest during ventilation of the lungs
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Abdomen
The lower region of the body
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Breathe
The physical movement of air into and out of the lungs
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Intercoastal Muscles
The muscles between the ribs which raise and lower them during breathing movements
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Domed
A curved, dome shape
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Vacuum
An area with little or no gas pressure
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Negative Pressure
A system when the external pressure is lower than the internal pressure
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Positive Pressure
A system where the external pressure is higher than the internal pressure
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Trachea
The main tube lined with cartilage rings which carries air from the nose and mouth down towards the lungs
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Villus
A finger like projection from the lining of the small intestine which increases the surface area for the absorbtion of digested food into the blood
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Evaporation
The change of a liquid to a vapour at a temperature below its boiling point
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Root hair cell
Cell on the root of a plant with microscopic hairs which increases the surface area for the absorbtion of water from the soil
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Transpiration Stream
The movement of water through a plant from the roots to the leaves as a result of the loss of water by evaporation from the surface of the leaves
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Guard cells
The cells which surround stomata in the leaves of a plant and control their opening and closing
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Wilting
The process by which plants droop when they are short of water or too hot. This reduces water loss and prevents cell damage
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Other cards in this set

Card 2

Front

Allowing only certain substances to pass through

Back

Partially Permeable

Card 3

Front

The movement of substances against a concentration gradient and/or across a cell membrane, using energy

Back

Preview of the back of card 3

Card 4

Front

lacking in water

Back

Preview of the back of card 4

Card 5

Front

To restore water to a system

Back

Preview of the back of card 5
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