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Human Respiratory System

Contraction o...

Question

Contraction of diaphragm increases the volume of thoracic chamber in the

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Solution

Contraction of diaphragm

During inspiration, the contraction of diaphragm occurs and it become flat. This increase the volume of the thoracic cavity in the longitudinal direction i.e., antero-posterior axis.

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

Q. Read the following statements about human respiration

(i) Trachea divides at the level of the

6^{th}

thoracic vertebra.
(ii) Terminal bronchioles, alveoli and their ducts form the respiratory part of this system.
(iii) Contraction of the diaphragm increases volume of thoracic chamber dorsoventrally.
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(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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Human Respiratory System

Standard IX Biology

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