Through breathing, inhalation and exhalation, the respiratory mechanism facilitates the exchange the gases between the air and also the blood and between the blood and also the body’s cells. The respiratory tract system additionally helps us to smell and create sound. The following are the five crucial functions that the respiratory system.

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1. Inhalation and Exhalation space Pulmonary Ventilation—That’s Breathing


The respiratory mechanism aids in breathing, additionally called pulmonary ventilation. In pulmonary ventilation, wait is inhaled through the nasal and oral cavities (the nose and mouth). It moves through the pharynx, larynx, and trachea right into the lungs. Then air is exhaled, flowing ago through the exact same pathway. Transforms to the volume and also air push in the lungs create pulmonary ventilation. Throughout normal inhalation, the diaphragm and external intercostal muscles contract and also the ribcage elevates. Together the volume the the lungs increases, air pressure drops and also air rushes in. During normal exhalation, the muscle relax. The lungs come to be smaller, the air pressure rises, and also air is expelled.

2. Outside Respiration Exchanges Gases between the Lungs and also the Bloodstream


Inside the lungs, oxygen is exchanged for carbon dioxide waste through the procedure called outside respiration. This respiratory procedure takes location through numerous millions of microscopic sacs called alveoli. Oxygen indigenous inhaled wait diffuses indigenous the alveoli into pulmonary capillaries neighboring them. It binding to hemoglobin molecules in red blood cells, and also is pumped with the bloodstream. Meanwhile, carbon dioxide from deoxygenated blood diffuses indigenous the capillaries right into the alveoli, and is expelled through exhalation.

3. Interior Respiration Exchanges Gases in between the Bloodstream and also Body Tissues


The bloodstream delivers oxygen come cells and also removes rubbish carbon dioxide through interior respiration, another vital function that the respiratory system. In this respiratory process, red blood cells bring oxygen absorbed from the lungs around the body, with the vasculature. Once oxygenated blood reaches the small capillaries, the red blood cells relax the oxygen. That diffuses v the capillary walls right into body tissues. Meanwhile, carbon dioxide diffuses from the tissues into red blood cells and plasma. The deoxygenated blood carries the carbon dioxide ago to the lungs for release.

Red blood cell

Red blood cells bring inhaled oxygen to the body"s tissues and bring carbon dioxide ago to the lungs to it is in exhaled.



Phonation is the creation of sound by structures in the top respiratory street of the respiratory system. Throughout exhalation, air overcome from the lungs v the larynx, or “voice box.” when we speak, muscles in the larynx move the arytenoid cartilages. The arytenoid cartilages press the vocal cords, or vocal folds, together. When the cords are driven together, air passing in between them makes them vibrate, developing sound. Greater tension in the vocal cords creates much more rapid vibrations and also higher-pitched sounds. Lesser tension causes slower vibration and also a lower pitch.

5. Olfaction, or Smelling, Is a chemistry Sensation


The procedure of olfaction starts with olfactory fibers the line the nasal cavities within the nose. Together air beginning the cavities, part chemicals in the air tie to and activate nervous mechanism receptors on the cilia. This stimulus sends out a signal come the brain: neurons take the signal native the sleep cavities with openings in the ethmoid bone, and then come the olfactory bulbs. The signal climate travels indigenous the olfactory bulbs, follow me cranial nerve 1, come the olfactory area of the cerebral cortex.

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External Sources

Cadaver images of lungs from Stony Brook University school of Medicine. The body Online.

Anatomy & Physiology through Visible body provides detailed coverage of every body system in a guided, visually stunning presentation.

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