Question

name: date: period: respiratory system 1. smaller and narrower tubes 2. moves into the lungs, which is picked up by blood cells and taken to every part of the body. 3. movement of air into and out of the lungs 4. the trachea splits into how many tubes before entering the lungs. 5. once the oxygen is used, it binds with the ____ and then returned to the so it can be expelled. 6. during exhalation, the diaphragm __and moves__ reducing the space around the lungs and air pressure in the chest increases. 7. large muscles below the lungs which makes up the floor of the thoracic cavity, which is the cavity that holds the lungs. 8. the two tubes that branch off from the trachea and enter the lungs. 9. during inhalation, the diaphragm__and moves__ enlarging the space around the lungs, reducing air pressure inside the chest. 10. microscopic sacs at the end of each bronchiole; site of gas exchange 11. breathe out 12. breathe in 13. windpipe tube that connects the pharynx to the lungs 14. called the voicebox 15. a tubelike passageway at the top of the throat that receives air, food, and liquids from the mouth or nose. a. blood, lungs b. diaphragm c. relaxes, up d. exhale e. alveoli f. breathing g. pharynx h. bronchioles i. two j. contracts, down k. trachea l. bronchi m. larynx n. inhale o. air containing oxygen

Explanation:

1. Bronchioles are smaller and narrower tubes in the respiratory system.
2. Oxygen - containing air moves into the lungs and is picked up by blood cells.
3. Breathing is the movement of air into and out of the lungs.
4. The trachea splits into two tubes (bronchi) before entering the lungs.
5. Once oxygen is used, it binds with carbon - dioxide to be expelled.
6. During exhalation, the diaphragm relaxes and moves up.
7. The diaphragm is the large muscle below the lungs forming the floor of the thoracic cavity.
8. The two tubes that branch off from the trachea and enter the lungs are bronchi.
9. During inhalation, the diaphragm contracts and moves down.
10. Alveoli are the microscopic sacs at the end of each bronchiole for gas exchange.
11. Exhale means to breathe out.
12. Inhale means to breathe in.
13. The trachea is the windpipe tube connecting the pharynx to the lungs.
14. The larynx is called the voicebox.
15. The pharynx is a tubelike passageway at the top of the throat receiving air, food, and liquids.

Answer:

1. H. bronchioles
2. O. air containing oxygen
3. F. breathing
4. I. two
5. (Not provided in options, should be carbon - dioxide)
6. C. relaxes, up
7. B. diaphragm
8. L. Bronchi
9. J. contracts, down
10. E. alveoli
11. D. exhale
12. N. inhale
13. K. trachea
14. M. larynx
15. G. pharynx