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.
- Why is heart useful?
- What makes heart sound like lub?
- When is blood shifted to right hand side?
- What is bronchitis?
- How are proteins digested?
- What are stamens?