Respiration in invertebrates

There are three types of respiration in invertebrates: 1. Cutaneous respiration 2. Gill respiration 3. Tracheal respiration

1. Unicellular organisms provide gas exchange by simple diffusion through the cell membrane. 2. Invertebrates, like hydra and planaria, use different methods to provide gas exchange. Their wide body surface provides enough area to take enough oxygen. 3. More developed invertebrates, like earthworms, provide gas exchange through their body surface and oxygen is transported to cells by circulatory system.

Hydra and planaria provide gas exchange by diffusion through their wide body surface and body extensions.

Are the respiratory organs of aquatic organisms. They’re formed from the projections of epithelium and are closely associated with the circulatory system.

Starfish and sea worms have gill respiration.