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.
Learn also:
- What are pacemakers?
- What is digestive system?
- What is concentration of components in deoxygenated blood?
- Who mostly has bronchitis?
- Why blood moves around body?
- What is job of phloem?


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