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Phrenic Muscles

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Phrenic nerves is supplied to the diaphragm. The diaphragm and the external intercostal muscles simultaneously contracts during inspiration. Thoracic cavity enlarges in all directions. Chest expansion during inspiration occurs after any muscular activity. The diaphragm and the external intercostal muscles are the muscles mainly used in normal quiet breathing.
External respiration
Gaseous exchange occurs by diffusion between the blood in the alveolar capillaries and the alveoli in the exchange of gases. Alveolar walls are one cell thick embedded by a network of capillaries.
High levels of carbon dioxide and low levels of oxygen arrived in the pulmonary artery in the lungs which has travelled from all body tissues. Carbon dioxide diffuses into …show more content…
Respiration is controlled by nerve cells in the brain stem: respiratory centre in the medulla oblongata and the pneumotaxic centre in the pons varolli. The cells in the respiratory centre are concerned with inspiration and those in the pneumotaxic centre with the inhibition of inspiration, resulting in expiration.
Nerve impulses that leave the respiratory centre to the diaphragm via the phrenic and intercostal nerve results in inspiration as intercostal muscles are stimulated to contract.
There are nerve endings in the lungs which are sensitive to stretch. They are stimulated when the lungs inflate. The nerve impulses produced are passed to the pneumotaxic centre and expiration happens.
In the carotid bodies and in the aorta's arch, peripheral chemoreceptors are present which are called carotid bodies and aortic. They are cells which are sensitive to changes in the partial pressure of oxygen and carbon dioxide in the blood. Nerve impulses originating from these cells are transmitted into the respiratory centre. The respiratory centre and chemoreceptors are stimulated by an increase in the partial pressure of carbon dioxide in the blood, resulting in an increase of ventilation in the lungs. It has the same effect when partial pressure of oxygen

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