Types of Respiratory Surface

Topic Content:

The respiratory surface is a special area that is developed in order to satisfy the requirements for gaseous exchange in larger organisms. Examples include external gills, internal gills, lungs, and the insect tracheae.

Body Surface:

1. Cell membrane: In simple unicellular organisms, such as Amoeba and paramecium, the cell is close to the external environment. These organisms are small, and their surface area to volume ratio is large, literally, gaseous exchange occurs by diffusion across the surface membrane. These organisms do not have specialized structures for gaseous exchange to meet their oxygen demand.

2. Cutaneous respiration: It is a form of respiration in which gaseous exchange occurs through the skin of some animals such as earthworms, frogs, and toads. In these organisms, the surface area to volume ratio is large. In these organisms, their skin is kept moist so that oxygen or carbon dioxide can easily dissolve in the moisture before it diffuses across the body surface, which is richly supplied with blood vessels so that dissolved oxygen diffuses easily into the blood and is transported to all parts of the body.

Gills:

A