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

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

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

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

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

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

Small intestine : A thin membrane known as the  mesentery  extends from the posterior body wall of the abdominal cavity to surround the...

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

Endocrine glands  : Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood r...

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