Tracheal Systems

Tracheal Systems - and small openings. Lung breathing...

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Tracheal Systems Many terrestrial animals have their respiratory surfaces inside the body and connected to the outside by a series of tubes.Tracheae are these tubes that carry air directly to cells for gas exchange. Spiracles are openings at the body surface that lead to tracheae that branch into smaller tubes known as tracheoles. Body movements or contractions speed up the rate of diffusion of gases from tracheae into body cells. However, tracheae will not function well in animals whose body is longer than 5 cm. Lungs Lungs are ingrowths of the body wall and connect to the outside by as series of tubes
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Unformatted text preview: and small openings. Lung breathing probably evolved about 400 million years ago. Lungs are not entirely the sole property of vertebrates, some terrestrial snails have a gas exchange structures similar to those in frogs. Respiratory System Principles 1. Movement of an oxygen-containing medium so it contacts a moist membrane overlying blood vessels. 2. Diffusion of oxygen from the medium into the blood. 3. Transport of oxygen to the tissues and cells of the body. 4. Diffusion of oxygen from the blood into cells. 5. Carbon dioxide follows a reverse path....
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Tracheal Systems - and small openings. Lung breathing...

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