Smart people! Quick help!?

Question

It's for the science test review. I don't get it. 1. which muscle contracts to pull air into the lungs?2.Name the major structures of the human respiratory system. 3.Describe the path of oxygen from outside the body to the alveoli.4. How does oxyget in the alveoli get into the blood? 5.Describbe the structure of the lung.6. What is the function of hairs and mucus in the respiratory passages? 7.What leaves the body with each exhaled breath? (is it carbon dioxide?) Answer as much as you can. Thanks!

Answer 1

I will try to answer some of your questions:

The diaphragm contracts during the inspiration process

Path of oxygen from outside the body to the alveoli:-

nose(mouth) - larynx - trachea(windpipe) - bronchus - bronchiole- alveolar duct -a. arches- alveoli

Oxygen in the alveoli gets into the blood system through the diffusion process occuring in the alveolar (respiratory) membrane; where oxygen travels from the alveoli to the pulmounary vessels

the function of hair and mucus in the nasal cavity is to trap dirt particles in order to prevent them from entering into the air- ways and impeding the breathing process.

Carbon dioxide is removed from the body during expiration.