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Mechanism of Breathing

How the contr...

Question

How the contraction of intercostal muscles increase the volume of lungs?
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Solution

The contraction of intercostal muscles moves the ribs of the thoracic walls outwards and upwards, thereby increasing the volume of the thoracic cavity and consequently increasing the volume of the lungs.

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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. Which of the following sequences is correct to initiate inspiration?
(i) The contraction of external intercostal muscles raises the ribs and sternum
(ii) Volume of thorax increases in the dorso-ventral axis
(iii) Intrapulmonary pressure decreases
(iv) Diaphragm contraction
(v) Air rushes into lungs
(vi) Volume of thorax increases in the anterior-posterior axis

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.

Mark the correct pair of muscles involved in normal breathing in humans.

(a) External and internal intercostal muscles

(b) Diaphragm and abdominal muscles

(c) Diaphragm and external intercostal muscles

(d) Diaphragm and intercostal muscles

Q. Fill in the blanks with approriate words.
The internal intercostal muscles contract during ..........

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