Arrector pili
Arrector pili (plural: arrectores pilorum) is a small fan-shaped smooth muscle attached to each hair follicle in mammals. The hair stands on end when the muscle contracts. অ্যারেক্টর পিলি:...
View ArticleAccessory respiratory organ
An organ that allows some fishes (air breathing fishes) to takes oxygen directly from the air. Such as skin of Anguilla anguilla, pharyngeal diverticula of snakeheads, tubular air sac and arborescent...
View ArticleAcoelom
Acoelom means a body cavity which is filled with cell and tissue in place of body fluid. It is lacking of body fluid and also lacking of peritoneum. An animal having acoelom (means having no fluid...
View ArticleAcoelomata
Acoelomata is the group that includes acoelomates. Acoelomates (singular: acoelomate) means a group of animals that lacks fluid filled body cavity named coelom. Body cavity (the space between outer...
View ArticleAmphibia
Amphibia is the group (Class) of vertebrates that includes amphibians (singular: amphibian). The word Amphibia consists of Greek word “amphi” meaning “on both side” and “bios” meaning life. Amphibians...
View ArticleAmphibians
Amphibians (singular: amphibian) are cold-blooded vertebrates (usually tetrapod/four-footed, carnivorous and oviparous) which young are commonly under go metamorphosis from water-breathing larva with...
View ArticleAestivation
Aestivation (also spelled “estivation”) is a situation of inactivity and a lowered metabolic rate of animal during summer as well as dry season. Most of all coldblooded (also known poikilothermic or...
View ArticleAquatic birds
Birds that live (feeding, breeding, staying) on or around water (aquatic environment) are known aquatic birds. On the other hand, birds that depend on aquatic environment to complete their life-cycle...
View ArticleAquatic animal
Animals that live in water are known aquatic animals. On the other words, an aquatic animal is an animal which completes their life-cycle (all or most) in water. Example: Fishes, Turtles, Crocodiles,...
View ArticleAquatic mammals
Mammals that live in water are known aquatic mammals. On the other words, aquatic mammals is a diverse group of mammals which completes their life-cycle (all or most) in water. Example: Dolphin,...
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