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AS Biology
Chapter 1.1 ­ Transport around the body

Diffusion ­ Movement of particles in a liquid or a gas down a concentration gradient from an area
where they are at a relatively high concentration to an area where they are at a relatively low
concentration.

The surface area to…

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Surface tension is a property of liquids when they behave as if the surface is covered by a thin elastic
skin. Water has a high surface tension because water molecules form hydrogen bonds, which tend to
pull them together.

The water molecule is amphoteric. It can act both as an…

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Transportation of Oxygen
The haemoglobin molecules When blood enters the lungs, Oxygen moves into the cells
transport oxygen. Each the concentration of oxygen from the air in the lungs by
molecule can hold 4 in the red blood cells is low. diffusion.
molecules of oxygen.

In the body tissues the…

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Birds and mammals have a double circulation because they use up a lot of energy whilst maintaining
a constant body temperature.

The systemic circulation carries oxygenated blood from the heart to the cells of the body, and
carries deoxygenated blood back to the heart.

The pulmonary circulation carries deoxygenated blood…

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