Exchange surfaces

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A single-celled organism has a relatively large surface area:volume ratio
The tissues of a multicellular organism consist of cells with a similar structure and function. Organs, such as the heart and lungs, are made of tissues.
One organ may consist of several tissues. Organ systems, such as the circulatory system, are groups of organs that perform a particular function.
In multicellular organisms many organ systems are specialised for exchanging materials. The effectiveness of an exchange surface is increased by: • having a large surface area • a membrane that is thin, to provide a short diffusion path • (in animals) having an efficient blood supply • (in animals, for gaseous exchange) being ventilated

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Exchange surfaces

Cards (4)

2.1.2 Exchange Surfaces and a Transport System

3.1 Exchange surfaces

1. Body Systems

1.1.7 Major muscles in the human body

3.2 Human Defence Systems

1.1.1 Major bones in the human body

1.1.7 Major muscles in the human body

6.21 Human Resource Information Systems (HRIS)

3.1.1 Surface area to volume ratio

1.4.2 Effects of regular training on body systems

2.2.1 The Human Digestive System

5.2 The Human Nervous System

Unit 2: Body Systems, Genetics, Microorganisms, and Health

3.1.2 Gas exchange in animals

1.1.1 Major bones in the human body

3.2 Human Defence Systems

1.2 Circulatory System

1.3 Respiratory System

1.4.2 Effects of regular training on body systems

5.2 The Human Nervous System

5.2 Combined Events