DIGESTIVE SYSTEM
Food is one of the basic need of life digestive system is concerned with food its swallowing digestion absorption assimilation and metabolism the digestive system consists of alimentary canal and the associated glands the alimentary canal starts from the mouth as a hollow musculo glandular tube dilated and deviated on its about 30 feet devious journey and ends at the anus various parts of the alimentary canal are pharynx oesophagus stomach duodenum jejunum ileum caecum large intestine colon and the rectum the associated glands are salivary pancreas and liver
The digestion takes place mainly in duodenum jejunum however it starts with the digestion of starch in the mouth stomach stores and mechanically churns the food partial digestion of food specially of proteins also start here pancreatic secretion bile and intestinal secretions provide enzymes for the digestion the gastric and intestinal peristaltic movements produce mechanical digestion as against the biochemical secretion absorption of the digested food occurs in the small intestine water is mainly absorbed from stomach and the colon various drugs and vitamins are absorbed from the small intestine the liver is the metabolic factory of the body and metabolism of the foods occurs here liver is thus the lever of health
RESPIRATORY SYSTEM
One can live without food for a month or so but one cannot survive for more than few minutes without oxygen this oxygen is continuously being exchanged with carbon dioxide in the body through the respiratory system it consists of nasal cavity pharynx larynx thachea bronchi bronchioles and lung intercostal muscles and diapharagm are the respiratory muscles which contract and relax for inspiration and expiration respectively
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