Coelom is a fluid filled body cavity between the most inner membrane (parietal peritoneum) of body wall and the most outer membrane (visceral peritoneum) of alimentary canal and other internal organs (liver, heart, lung etc.) of an animal. It is
Ichthyology
Ichthyology is the branch of zoology dealing with fishes. It deals with mainly fish biology (such as origin, evolution, taxonomy, morphology, physiology, ecology, cell biology, histology, genetics etc.) The word Ichthyology is consist of two Greek words such as “ikhthus”
Receptor organ
Receptor organ (also known as sensor, sense organ, sensory organ, receptor) is an organ that detects and receives external and internal stimulus or a group of stimuli and sends (as nerve impulse) to central nervous system via sensory or afferent
Receptor
Receptor (also known as sensor, sense organ, sensory organ, receptor organ) is an organ that detects and receives external and internal stimulus or a group of stimuli and sends (as nerve impulse) to central nervous system via sensory or afferent
Sensory organ
Sensory organ (also known as sensor, sense organ, receptor, receptor organ) is an organ that detects and receives external and internal stimulus or a group of stimuli and sends (as nerve impulse) to central nervous system via sensory or afferent
Sense organ
Sense organ (also known as sensor, sensory organ, receptor, receptor organ) is an organ that detects and receives external and internal stimulus or a group of stimuli and sends (as nerve impulse) to central nervous system via sensory or afferent
Sensor
Sensor (also known as sense organ, sensory organ, receptor, receptor organ) is an organ that detects and receives external and internal stimulus or a group of stimuli and sends (as nerve impulse) to central nervous system via sensory or afferent
Ethology
Ethology is the branch of zoology that studies the animal behaviour. On the other hand, ethology means the scientific study of animal behavior. The word Ethology formed from Greek word “ethos” that means “character” and “logos” means “knowledge”) Animal behaviour
Behaviour
Behaviour means the expression of total responses of an animal to a specific stimulus or group of stimuli. আচরণ: অভ্যন্তরীণ বা বাহ্যিক উদ্দীপকের উপস্থিতির প্রেক্ষিতে প্রাণী দেহে যে প্রতিক্রিয়ার সৃষ্টি হয় তার বহিঃপ্রকাশকে আচরণ বলে। সহজ কথায় প্রাণী
Islets of Langerhans
Islets of Langerhans (also known as Islands of Langerhans) are the groups of pancreatic cells as well as endocrine gland secreting hormones named insulin and glucagon. They are named for the German physician Paul Langerhans, who first described them in
Pancreas
Pancreas is a large gland of digestive system as well as endocrine system consisted of Acinar cells and Islets of Langerhans cells and located behind the stomach. Acinar cells worked as exocrine gland and produced digestive enzymes. On the other
Accessory 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 organ of some catfishes, labyrinthine organ of climbing perch,
Endocrine gland
Substance (hormone) producing as well as secreting ductless gland of an animal that secretes directly into the blood or lymph stream. Such as pituitary gland, thyroid gland, adrenal gland, Islets of Langerhans, Hypothalamus etc. The word Endocrine derives from the