Question

(3)
Between the thoracic cavity and
Exchange of oxygen and carbon dioxide takes place in the
The inner lining of the respiratory organs has fine hairlike structure
Column 'B
(a)
Circulation
called
*Q.2. Match the following.
Column 'A'
Ans.
(1) Lungs
(2) Stomach
(3) Heart
(b)
Respiration
Co-ordination
Digestion
(d)
(4) Brain
3. Choose the appropriate word from the brackets.
(Circulation, trachea, diaphragm)
Respiration takes place because of its up and down movement.
Cloning the blood flowing continuously the​

Answer 1

1 alveoli

Within the lungs, the bronchi branch into smaller bronchi and even smaller tubes called bronchioles (pronounced: BRAHN-kee-olz). Bronchioles end in tiny air sacs called alveoli, where the exchange of oxygen and carbon dioxide actually takes place. Each person has hundreds of millions of alveoli in their lungs.

3=large dome-shaped muscle under the lungs called the diaphragm squeezes downward when you breathe in, making a vacuum that causes a rush of fresh air into your lungs. The opposite happens when you breathe out -- your diaphragm relaxes upward, pushing on your lungs, letting them deflate.