Human Nutrition

Human Nutrition


Digestive System

In this note we learned about the process of digestion. Food enters the mouth and then is crushed into pieces by the teeth. Saliva mixed with food will generate a semi-liquid mass called bolus. Bolus enters into stomach through esophagus which is guarded by two sphincter. The top sphincter is called epiglottis and lower sphincter is called lower esophageal sphincter. Bolus is turned into chyme by dissolving it in Hydrochloric acid in the stomach. Most of the chyme is digested and absorbed in small intestine

Respiratory and Excretory System

A human respiratory system is a group of the organ that is responsible for taking in oxygen and expelling carbon dioxide. Similarly, respiration is the removal of waste product from our body. This note provides information about the respiratory system and excretory system of humans.