In health the two pleurae are in contact. Oxygen and carbon dioxide must be transported to and from the lungs and tissue cells of the body via the bloodstream. This is known as internal or tissue respiration. Here is how lungs work as the center of your breathing, the path a full breath takes in your body, and a 3-D model of lung anatomy. Gas exchange between the pulmonary blood and alveoli must take place. Its main function is protection. Pleura, plural pleurae, or pleuras, membrane lining the thoracic cavity (parietal pleura) and covering the lungs (visceral pleura). Human respiratory system - Human respiratory system - The mechanics of breathing: Air moves in and out of the lungs in response to differences in pressure. The parietal pleura folds back on itself at the root of the lung to become the visceral pleura. The oropharynx consists of stratified squamous epithelium and the laryngopharynx consists of respiratory pseudostratified. The diaphragm is a dome-shaped muscle that curves upwards towards the lungs. The lungs are the main part of your respiratory system. The exchange of oxygen of the air for the carbon dioxide of the blood takes place in the respiratory organs and is known as external respiration. For Cellular respiration C6H12O6+6O2 ---> (many enzymes many steps)---> 6CO2+6H2O+energy(used to make ATP) + heat Why do we need to get rid of the CO2 gas made by cellular respiration? When it contracts, it becomes flattened and therefore increases the volume of the thoracic cavity. ; Pharynx – It is a passage behind the nasal chamber and serves as the common passageway for both air and food. Muscles of the Respiratory System. There are two other types of animal tissue—muscular and nervous. ADVERTISEMENTS: Human Respiratory System and it’s Mechanism! Respiratory gas transport. External respiration. The regions of the pharynx are nasopharynx, oropharynx, and laryngopharynx. The respiratory system, which includes air passages, pulmonary vessels, the lungs, and breathing muscles, aids the body in the exchange of gases between the air … At systemic capillaries, gas exchanges must be made between the blood and tissue cells. ; Nasal chamber – which is lined with hair and mucus to filter the air and remove dust and dirt. Animal tissues: The cheek cells are a type of epithelial tissue, while blood is a kind of connective tissue. PHARYNX is made up of the fibromuscular tube that consists of a ring of specialized lymphatic tissue. Air enters the nose through the nostrils. Internal respiration. The respiratory tract in humans is made up of the following parts: External nostrils – For the intake of air. Similarly, contraction of the external intercostal muscles moves the ribs upwards and outwards. Epithelial tissue: This tissue covers the surface of the body and lines the internal organs. 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