The purpose of the respiratory system is to shake oxygen into the body and waste gases out.
Respiration occurs at 2 different levels: the level of the organism, also know as outdoor(a) respiration and the level of the cell, also known as innate respiration or cellular respiration.
External Respiration
This destination describes the process whereby post from outside the body is inspired or inhaled, so supplying oxygen, whilst single-valued functiond air (carbon dioxide and waste gases) from inside(a) the lungs ar expired or exhaled. This is what is generally referred to as breathing.
intimate Respiration
This is the exchange of gases between the circulatory system and the tissues of the body. cellular respiration describes the chemical processes (such as oxidisation) involved when individual molecules use oxygen, creating carbon dioxide as a waste product.
The Passage of type O from Nose to Lungs
During external respiration or breathing, air is pull in through the nose, where it is warmed, filtered and moistened. It then passes through the pharynx, larynx and windpipe and into the thoracic cavity containing the lungs. Here the trachea forms two branches called bronchi which have-to doe with to smaller bronchioles within the left and right lungs.
At the break off of each bronchiole are clusters of tiny sacs called alveoli, where the gaseous exchange happens.
What Causes dream?
The lungs are not attached to any major muscles and are physically passive during breathing (external respiration).
The impulse to breathe comes from chemoreceptors primed(p) in the carotid arteries and the aorta. These nerve cells are stimulated by low levels of oxygen and high levels of carbon dioxide. They send a message to the respiratory centre of the brain, the medulla oblongata. The brain in turn sends an impulse to the diaphragm making it contract which creates a drop in air pressure within the lungs. This causes air to be drawn in through the respiratory system and...If you want to get a full essay, order it on our website: Ordercustompaper.com
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