Introduction
Description Example Simple Diffusion The movement of molecules along the concentration gradient (no energy required) across a partially permeable membrane ...
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Circulatory System
The general pattern of blood circulation is: Large Surface Area: Decrease in the surface area:volume ratio Suitable median: A method ...
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Tissue Fluid
Tissue fluid is the liquid that surrounds the cells It allows for transport of molecules such as respiratory gases between ...
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Gases Exchange in Humans
Pathway of Air Air enters through the nostrils and mouth passing through: Pharynx Glottis Trachea (protected by cartilaginous rings) Bronchi ...
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Blood Vessels
Arteries: Carry blood from the heart to the rest of the body Their cell walls are made up of layers, ...
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Gas Exchange in Fish
Fish have thick skin that enable them to be waterproof however the result of this is gases cannot readily diffuse ...
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Transport of Organic Substances in the Phloem
The phloem transports dissolved products of photosynthesis in various directions around the plant Phloem Structure The individual sieve tube elements ...
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Gas Exchange in Insects
Insects have tracheae which allow for gas exchange but also prevents water loss The gases enter through the open spiracles ...
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