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1

True or false. The particles of cigarette smoke clog the alveoli in the lungs.
A)True
B)False
2

External respiration is the exchange of gases between the ____________.
A)air and respiratory surfaces
B)respiratory surfaces and blood
C)blood and cells
3

True or false. An aquatic organism requires a smaller respiratory surface than a terrestrial animal of similar size.
A)True
B)False
4

Animals that exchange gases through body surfaces alone include all of these except __________.
A)cnidarians
B)flatworms
C)sea anemones
D)insects
5

What organisms have a tracheal respiratory system?
A)flatworms
B)centipedes
C)jellyfish
D)frogs
6

True or false. Countercurrent flow maximizes the amount of oxygen that can be extracted from water using gills.
A)True
B)False
7

What trend in lung design is evident in the evolutionary sequence from amphibians to reptiles to birds to mammals?
A)increased surface area
B)capillary networks
C)lungs inside body
D)All of these are correct.
8

What is the function of the nose in the respiratory system?
A)filtration
B)warming
C)humidifying
D)All of these are correct.
9

True or false. Cigarette smoke disrupts all the vital functions of the nose.
A)True
B)False
10

The _________ prevents food from entering the respiratory system.
A)pharynx
B)larynx
C)glottis
D)epiglottis
11

True or false. Cilia line the bronchial tree.
A)True
B)False
12

True or false. Each human lung is divided into three lobes.
A)True
B)False
13

The thoracic cavity is separated from the abdominal cavity by _____________.
A)a muscular diaphragm
B)the ribcage
C)surfactant
D)None of these is correct.
14

The amount of air inhaled or exhaled during a normal breath is _____________.
A)dead space
B)residual air
C)tidal volume
D)vital capacity
15

Oxygen is carried in the blood bound to _____________.
A)plasma proteins
B)hemolymph
C)myoglobin
D)hemoglobin in red blood cells
16

What enzyme is responsible for speeding up the conversion of carbon dioxide to bicarbonate ion?
A)carbonic anhydrase
B)carbonic lipase
C)bicarbonate anhydrase
D)bicarbonate lipase
17

Why is carbon monoxide so deadly?
A)acts as a systemic poison
B)slows speed of carbonic anhydrase
C)binds more readily than oxygen to hemoglobin, blocking oxygen transport
D)inhibits release of surfactant
18

What part of the brain is responsible for the control of respiration?
A)cerebral cortex
B)medulla
C)cerebellum
D)hypothalamus
19

Breathing rate is regulated in the medulla based on the concentration of ___________ in the blood.
A)oxygen
B)chlorine ion
C)carbon dioxide
D)None of these is correct.





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