During inhalation, the diaphragm becomes (i) and ribs move _(ii)_____ .

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Solution

Answer: (i) flat, (ii) upwards
During inhalation, the diaphragm flattens and the ribs move upwards and outwards due to contraction of the intercostal muscles. This increases the volume of the thoracic cavity and the pressure decreases. As the outside pressure is higher, air gushes into the lungs.

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Question 14
Which of the following statement(s) is (are) true about respiration?

(i) During inhalation, ribs move inward and the diaphragm is raised.
(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from the blood into the alveolar air.
(iii) Haemoglobin has a greater affinity for carbon dioxide than oxygen.
(iv) Alveoli increase surface area for exchange of gases.

(a) (i) and (iv)
(b) (ii) and(iii)
(c) (i) and (iii)
(d) (ii) and (iv)

Q. Observe the figures given as (A) and (B) and answer the following.
(a) Which of the figures A or B indicates the process of inhalation and which the process of exhalation?
(b) In the figure label the arrows and indicate the direction of
(i) movement of air
(ii) movement of diaphragm
(iii) movement of rib

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During inhalation, the diaphragm becomes __(i)____ and ribs move ___(ii)_____ .

Answer: (i) flat, (ii) upwards During inhalation, the diaphragm flattens and the ribs move upwards and outwards due to contraction of the intercostal muscles. This increases the volume of the thoracic cavity and the pressure decreases. As the outside pressure is higher, air gushes into the lungs.

During inhalation, the diaphragm becomes (i) and ribs move _(ii)_____ .

Answer: (i) flat, (ii) upwards
During inhalation, the diaphragm flattens and the ribs move upwards and outwards due to contraction of the intercostal muscles. This increases the volume of the thoracic cavity and the pressure decreases. As the outside pressure is higher, air gushes into the lungs.