The digestive system of humans is not meant to digest grass. Explain why?
Answers
Answer:
We (human beings) cannot survive by eating only grass (or raw leafy vegetables) because these foods contain mainly cellulose carbohydrate and our body does not have bacteria which can digest cellulose carbohydrate.
Answer:
Release of energy from the assimilated food is called respiration.
Inhalation and exhalation is called breathing,when inhalation is done the air passes through the lungs the oxygen from this air e years the blood while carbon dioxide from the blood exist from the blood. Through exhalation, carbon dioxide is given out.this gaseous exchange occurs through alveolar membrane.this is called external respiration.
The rbcs carry oxygen to every cell.Here inside the mitochondria tissue respiration or Internal respiration takes place.the oxygen is used for production of energy.By oxidation of food nutrients energy is released in the firm of ATP.