LUNGS : The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts i...

HUMAN EXCRETORY SYSTEM : KIDNEYS : The kidneys are bean-shaped organs that serve several essential regulatory roles in vertebrates....

GASTRIC GLAND : The  gastric gland  is the basic secretory unit of the stomach and contains a variety of component cells located in char...

Circulatory system : The human circulatory system (simplified). Red indicates oxygenated blood carried in arteries, blue indicates deo...

Human skeletal system : The hard external or internal structures of the animals body is called skeleton. The external skeleton is know...

large intestine : In  mammals , the colon consists of four sections: the  ascending colon , the  transverse colon , the  descending colo...

NEPHRONS : Nephrons are structural and functional unit of kidney . each human kidney contains about 1 million ( 10 lakhs ) nephrons Th...

DIGESTIVE GLANDS : In the  human digestive system , the process of digestion has many stages, the first of which starts in the  mouth  (o...

Respiratory System : In physiology, respiration is defined as the movement of oxygen from the outside air to the cells within tissues, ...

Breathing  : Breathing is the process that moves air in and out of the lungs, or oxygen through other respiratory organs such as gills...