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Inspiration

During inspir...

Question

During inspiration the external intercostal muscles __ and the ribs move_.

A

relax, upwards and outwards

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B

contract, upwards and outwards

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C

relax, downwards and inwards

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D

contract, downwards and inwards

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Solution

The correct option is B contract, upwards and outwards
Inspiration is a process in which air is drawn into the lungs. The external intercostal muscles are muscles present in between the ribs. During inspiration, the external intercostal muscles contract, and the ribs move upwards and outwards.
Expiration is a process in which air is drawn out of the lungs. During expiration, the external intercostal muscles relax, and the ribs move downwards and inwards.

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Similar questions

Q. During inspiration the external intercostal muscles ________________ and the ribs move___________________

Q. Identify the sequence of steps involved during inspiration in rabbit.
(A) Volume of thoracic cavity increases
(B) Contraction of external intercostal muscles moves the rib cage forward
(C) Diaphragm becomes flat
(D) Thoracic cavity expands drawing air into lungs.

Q. Select the correct events that occur during inspiration.
(a) Contraction of diaphragm
(b) Contraction of external intercostal muscles
(c) Pulmonary volume decreases
(d) Intra-pulmonary pressure increases

Q. Read the given statements. How many of them are correct ?
a. Diaphragm contracts during inspiration.
b. Relaxation of external intercostal muscles lifts sternum upwards and outwards
c. Partial pressure of

O_{2}

in atmospheric air is higher than that in the alveoli, so

O_{2}

diffuses from atmospheric air into alveoli
d. During forceful expiration, abdominal muscles contract.
e. Inspiration in mammals is a passive process

Q. For the atmospheric air to go into our body, a low pressure is created when the internal intercostal muscles ______ and external intercostal muscles______ .

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