Respiratory System Practice Page 3
ADVERTISEMENT
1
2
3
48. Humans breathe more rapidly during exercise than before it because during exercise the blood
contains
A. an increased level of oxygen
B. a decreased number of red blood cells
C. an increased level of carbon dioxide
D. a decreased amount of hemoglobin
9. The human trachea is prevented from collapsing by the presence of
A. mucous membranes
B. cartilaginous rings
C. muscle fibers
D. bony networks
10. Some human structures and their functions are listed below.
In a single-celled organism such as an ameba, all these functions can be performed by the
A. nucleus
B. ribosomes
C. mitochondria
D. cell membrane
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education