GENERAL HISTOLOGY

Detailed explanation-1: -It is found in larger and complex form of animals. These organisms have some specialized structures for gaseous exchange called respiratory organs. These special respiratory organs include skin, buccopharyngeal lining, gills and lungs, and need the help of blood.

Detailed explanation-2: -Gills are evaginations of the body surface. Some open directly to the environment; others, as in fishes, are enclosed in a cavity. In contrast, lungs represent invaginations of the body surface. Many invertebrates use gills as a major means of gas exchange; a few, such as the pulmonate land snail, use lungs.

Detailed explanation-3: -gill, in biology, type of respiratory organ found in many aquatic animals, including a number of worms, nearly all mollusks and crustaceans, some insect larvae, all fishes, and a few amphibians.

Detailed explanation-4: -So respiration through the gills is known as branchial respiration. Gills are special vascularised structures that are used as respiratory organs by aquatic arthropods and molluscs.

Detailed explanation-5: -Pulmonary Ventilation. moving air into and out of the lungs. External Respiration. Transport. transport of oxygen and carbon dioxide between the lungs and tissues. Internal Respiration. diffusion of gases between the blood of the systemic capillaries and cells.