Study the following statements and choose the correct ones.
i) Contraction of external intercostal muscles increases the volume of the thoracic cavity in the dorsoventral axis.
ii) Contraction of internal intercostal muscles increases the volume of the thoracic cavity in the anteroposterior axis.
iii) Human beings have the ability to increase the strength of inspiration and expiration with the help of additional muscles in the abdomen.
iv) The diaphragm becomes flat due to the relaxation of external intercostal muscles.

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i, ii, iii

i, iii only

Only i

i, iii, iv

answer is B.

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Detailed Solution

i) Contraction of external intercoastal muscles increase the volume of thoracic cavity in the dorso-ventral axis.
ii) Contraction of internal intercoastal muscles occurs during forceful inspiration or expiration.
iii) Human beings have the ability to increase the strength of inspiration and expiration with the help of additional muscles in the abdomen.
iv) Diaphragm becomes dome-shaped due to the relaxation of external intercoastal muscles.

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