Nasal Cavity- where oxygen first enters your body. These are covered in hairs, which help to carry the gases to filter the air that enters the lungs, along with the production of micro-organisms. The function of the mucosa is to warm and humidify air entering through the nose as well as to help to filter out unwanted particles in the air.
Oral Cavity- Oxygen can also enter through your mouth but is not filtered.
Epiglottis- It allows air to pass through the larynx and into the rest of the respiratory system. When swallowing food or drink, it covers the entrance to the larynx to prevent food and drink from entering the windpipe.
Pharynx- It provide a passageway for the respiratory and digestive tracts. It allows common passageway for air into your lungs and food into your stomach. The upper part of the pharynx will only allow food to pass through, and the lower part of the pharynx allows air, fluids, and food to pass through.
Larynx- Involved in breathing, sound production, and protecting the trachea against food aspiration. It manipulates pitch and volume. The larynx houses the vocal folds, which are essential for phonation. The vocal folds are situated just below where the tract of the pharynx splits into the trachea and the esophagus.
Vocal Cords- Are composed of twin enfolding of mucous membrane stretched horizontally across the larynx. They vibrate, modulating the flow of air being expelled from the lungs during phonation.
Trachea- A principal tube that carries air to and from the lungs.
Lung- Occupying the chest cavity together with the heart and functioning to remove carbon dioxide from the blood and provide it with oxygen.
Aorta- The largest artery in the body, originating from the left ventricle of the heart and extending down to the abdomen, where it branches off into two smaller arteries . The aorta distributes oxygenated blood to all parts of the body through the systemic circulation.
Pulmonary Artery- Carry deoxygenated blood from the heart to the lungs.
Diaphragm- A muscular membranous partition separating the abdominal and thoracic cavities and functioning in respiration.
Alveolar Duct- The part of the respiratory passages beyond the respiratory bronchioles, from which the alveolar sacs and alveoli arise.
Alveolar Sac- Where the chemical change takes place and where blood cells pick up oxygen and drop off carbon dioxide.
Sinus- A cavity in the bones of your skull that helps moisten and heat the air that you breath.
Capillaries- Tiny blood vessels that pass blood from the arteries into the veins. Capillaries supplying blood to an organ, when taken in whole.
Bronchiole- Keep splitting up until they reach your alveoli.