Question

1. write the word from the box on the line that is being described.

diaphragm pharynx exhalation
alveoli trachea cilia bronchioles
a. smallest respiratory passageways in the lungs
b. tiny hairs that sweep out particles
c. windpipe
d. location where gas exchange takes place
f. both air and food pass through this
g. the movement of air out of the lungs
h. the main muscle involved in inhalation

1. arrange these statements in the right order to describe process of inhalation.

____ air is drawn into the lungs
____ air pressure in the chest cavity decreases
____ lungs expand
____ the diaphragm contracts and flattens
____ the muscles between the ribs contract to move the ribs up and out

Explanation:

For question 2, each term matches a structure/process of the respiratory system. For question 3, inhalation follows a sequence of muscle actions, chest cavity changes, and air flow.

Answer:

1. a. bronchioles

b. cilia
c. trachea
d. alveoli
f. pharynx
g. exhalation
h. diaphragm

1. 6 (Air is drawn into the lungs)

5 (Air pressure in the chest cavity decreases)
4 (Lungs expand)
1 (The diaphragm contracts and flattens)
2 (The muscles between the ribs contract to move the ribs up and out)

(Note: The numbering for question 3 assumes the sequence starts with muscle contractions: 1. Diaphragm contracts → 2. Intercostal muscles contract → 3. Chest cavity expands → 4. Lungs expand → 5. Pressure decreases → 6. Air drawn in. If "3" was missing in the original, it would be "Chest cavity expands", but based on given statements, the order is as above.)