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 is faeces?
- What is glycogen and where is it stored?
- Why thumb should not be used while checking pulse?
- What is job of phloem?
- Why is heart useful?
- Which enzyme acts on food in stomach?