How do jellyfish respire?

Jellyfish don't have lungs or gills like most animals. They respire through diffusion.

Here's how it works:

* Oxygen uptake: Jellyfish have a thin, permeable outer layer called the epidermis. Oxygen dissolved in the surrounding water can pass directly through this layer into their bodies.

* Carbon dioxide release: Similarly, carbon dioxide, a waste product of respiration, can diffuse out of their bodies through the epidermis.

Factors affecting diffusion:

* Surface area: Jellyfish have a large surface area relative to their volume, which helps maximize the amount of oxygen that can diffuse in.

* Thinness of the epidermis: The thin epidermis allows for efficient gas exchange.

* Water movement: Jellyfish often live in areas with good water circulation, which ensures a steady supply of oxygenated water.

Important note: While most jellyfish rely on diffusion for respiration, some larger species might have additional mechanisms. For example, some have internal cavities lined with specialized cells that help with gas exchange.