Answer: The path of oxygen from outside of the body to the blood stream:
From Outside the body
1. Nose
2. Pharynx
3. Larynx
4. Trachea
5. Bronchi
6. Bronchioles
7. Alveoli
8. Capillary
To Blood stream
Explanation: 1. The nasal cavity in the nose is where the air enters the throat. The nasal cavity is also responsible for maintaining humidity, temperature, and air pressure there. Inside the cavity, there are mucous membranes and nasal hairs. The cavity is formed by the bones of the skull that form the walls of the nose.
2. Pharynx is an organ at the top of the throat which is shaped like a long tube. This organ extends from the nose to the digestive system. In general, the function of the pharynx is to help the digestive and respiratory systems to function properly.
3. The larynx is part of the respiratory system. This organ connects the trachea (airway) and the windpipe. In addition to having an important role in producing sound, the larynx also functions to prevent food and drink from entering the respiratory tract.
4. Trachea or wind pipe is an air tube that has a large size and leads from the voice box or larynx to the bronchi or airways to the lungs.
5. Bronchus (plural: bronchi) is a branch of the windpipe that is located before the lungs. In the respiratory system, the bronchi play an important role as airways and ensure that air enters properly from the trachea to the alveoli
6. Bronchioles are branches of bronchi which are the main air passages in the lungs. The air you breathe when you breathe, will enter the lungs through the bronchi. However, in order for this air to spread evenly to the tissues in the lungs, an even smaller channel is needed.
7. Alveoli are air sacs in the lungs. The function of the alveoli is as a place of gas exchange in the respiratory system. The function of the alveoli is very important for the human respiratory system. Because these air sacs help circulate oxygen throughout the body.
8. Capillaries are small blood vessels with very large numbers that connect arteries to veins. Arteries are vessels that carry blood away from the heart, while veins are vessels that return blood to the heart. Capillaries have another name, namely microcirculation.
Hope that helps!