Question

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Answer 1

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1. The wind pipe which passes through the larynx to the bronchi.

:⟶Trachea or Windpipe.

• At its bottom end, the trachea divides into left and right air tubes called bronchi which connect to the lungs.
• Within the lungs, the bronchi branch into smaller bronchi and even smaller tubes called bronchioles

2. Balloon-like structures which are the actual sites of gaseous exchange.

:⟶Alveoli

• The alveoli (singular: alveolus) are tiny hollow air sacs that comprise the basic unit of respiration.
• Alveoli are found within the lung parenchyma and are found at the terminal ends of the respiratory tree, clustered around alveolar sacs and alveolar ducts.

3. The muscles which being about relaxation and contraction in the lungs.

:⟶The diaphragm

• The diaphragm, located below the lungs, is the major muscle of respiration.
• It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily.