Topic: Food Energy and Respiration Subtopic: Introduction
How does air reach blood vessels?
Answer: Air enters in the body through two passages i.e. nasal cavity (nose) and oral cavity (mouth). Afterwards, the air passes through trachea (windpipe) and reaches the bronchi. From bronchi the air moves to bronchioles and then reaches the alveoli (air sacs). The exchange of gases takes place in alveoli as blood vessels are present there.
- What are vitamins and functions?
- Which blood vessel carries blood and where?
- What is chemical process in digestion?
- What is quantity of re blood cells in blood?
- What is sequence of mineral and water transport?
- What is meant by word extinct?