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The contracti...

Question

The contraction of ___________ muscles lifts up the ribs and the sternum causing an increase in the volume of the thoracic chamber in the dorso - ventral axis.

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Solution

Contraction of external intercostal muscles

Contraction of external intercostal muscles results in expansion of chest cavity and elevation of ribs and sternum. Thus, it helps in taking in air inside.

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Similar questions

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. By the contraction in which of the following muscle, the volume of thoracic chamber increases in the antero-posterior axis?

Q. Select the correct statement.
i) Thoracic chamber is an open chamber filled with air.
ii) Thoracic chamber is built by dorsal ribs, ventral vertebral column, lower diaphragm and a lateral sternum.
iii) Any change in the thoracic cavity volume is not reflected in the lung cavity because of the anatomical setup of the lungs in the thorax.
iv) Humans can’t directly alter the pulmonary volume.

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. Which of the following option is correct regarding the characteristics of the diaphragm?

(A) Found in mammals.
(B) Separate the thoracic and Abdominal cavity.
(C) Formed by inter-costal muscles.
(D) Due to its contraction volume of thoracic cavity increases on Anterior-Posterior axis.

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Standard XII Biology

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