(a)
To determine:
The change in the tidal volume if vagus nerves are cut.
Introduction:
Tidal volume is the amount of air inhaled and exhaled during normal breathing. In an adult male, the tidal volume is 500ml. Tidal volume represents the efficiency of the lungs at rest.
(b)
To determine:
The change in the tidal volume if phrenic nerves are cut.
Introduction:
The organ system of the body that helps in the process of respiration is termed as the respiratory system. The respiratory system of humans is present in “air-filled” cavity called the thoracic cavity. The thoracic cavity plays a vital role in the process of inhalation and exhalation. It contains a muscular structure called the diaphragm.
(c)
To determine:
The change in the tidal volume if intercostal nerves are cut.
Introduction:
The mechanism of breathing involves contraction and relaxation of intercostal muscles. Breathing is controlled by the size of the diaphragm. The contraction and relaxation of intercostal muscles lead to a change in the size of the diaphragm.

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Chapter 23 Solutions
Seeley's Anatomy & Physiology
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