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 vascular bundle?
- What is activation energy?
- How does mineral salts enter roots?
- What is faeces?
- What are initial effects of tobacco smoke?
- What is filament an why is it useful?
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