The Respiratory System Take a deep breath Now
The Respiratory System Take a deep breath…. Now let’s begin! LI: To understand how the respiratory system works.
Human Lungs NOT Hollow Balloons but, a spongy organ
BREATHING …is the mechanical intake of air. Lungs are sealed in pleural membranes inside the chest cavity. At the bottom of the. Diaphragm cavity is a large, flat muscle known as the diaphragm.
During inhalation, the diaphragm contracts and the rib cage rises up. This expands the volume of the chest cavity. Rib cage The chest cavity is sealed, so this creates a partial vacuum inside the cavity. Atmospheric pressure fills the lungs as air rushes into the breathing passages. rises Diaphragm contracts
When the rib cage lowers and the diaphragm relaxes, pressure in the chest cavity is greater than atmospheric pressure. Air Exhaled Rib cage lowers Air is pushed out of the lungs. Exhalation
RESPIRATION …is the process of gas exchange—the release of carbon dioxide and the uptake of oxygen that occurs between RBCs and alveoli. Alveoli are grouped in clusters. A network of capillaries surrounds each alveolus. Pulmonary artery Pulmonary vein Capillaries
A gas exchange takes place in the alveoli. 0 xygen diffuses in to the blood to then travel round our body. Carbon dioxide in the blood diffuses in to the alveolus to be removed when we exhale. Capillary O 2 CO 2
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