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Lesson 21 Circulation and Gas Exchange


I. Circulation in animals

A. Importance of transport in animals


B. Types of transport

1. By diffusion: gastrovascular cavities

2. By circulatory systems

a. Open circulatory system

b. Closed circulatory system

general description

C. Circulation in mammalians: Organ and function

1. Heart

a. description

b. function

2. Blood vessels

a. Arteries and veins


-movement of fluid

b. Capillaries

-transfer of substances

3. Blood: Composition and function

a. Plasma

b. Cellular elements and stem cells

c. Blood clotting

4. Lymphatic system: structure and function


II. Gas exchange in animals

A. Importance of gas exchange in animals

B. Types of gas exchange systems

1. Adaption to aquatic environment: Gills

2. Adaption to terrestrial environment

a. The tracheal system

b. Lungs

C. Mammalian respiratory system

a. Description

b. Mechanisms of respiration

-Ventilation of the lungs

-Transport and diffusion of gas (oxygen and carbon dioxide)

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