Question

question 1
the trachea is kept open by c - shaped hyaline cartilage
true
false
question 2
during exhalation, the diaphragm:
relaxes and moves upward
relaxes and moves downward
contracts and moves downward
contracts and moves upward
question 3
the concentration of carbon dioxide in the earth’s atmosphere is

Explanation:

• For Question 1: The trachea has C - shaped hyaline cartilage rings that prevent it from collapsing and keep it open.
• For Question 2: During exhalation, the diaphragm relaxes and moves upward, reducing the volume of the thoracic cavity and forcing air out.

Answer:

• Question 1: True
• Question 2: relaxes and moves upward