BIO 182 Exam 2 UPDATED Exam
Questions and CORRECT Answers
The respiratory system of which of the following organisms relies on air sacs to move air
through the lungs?
birds
mammals
fish
amphibians
reptiles - CORRECT ANSWER - birds
Which of the following statements is true regarding respiration in mammals?
Select all that apply.
A. Air moves in a unidirectional fashion through the lungs.
B. Gas exchange occurs in the bronchioles.
C. Gas exchange occurs in the alveoli.
D. Respiration depends on changes in air pressure in the chest cavity.
E. Respiration depends on contractions of the diaphragm. - CORRECT ANSWER - C,D,E
Simple multicellular organisms that are small can meet their gas exchange needs by means of:
Select all that apply.
A. a flattened body shape that increases surface area
B. a flattened or thin body shape that reduces the distance between cells inside their body and the
external environment
C. by living in air that provides abundant oxygen, even though they are at risk of losing water
and drying out
,D. by living in water so that they do not dry out from water loss, even though water has less
oxygen per volume than air
E. by relying on anaerobic respiration (glycolysis) for long time periods, so that they don't need
to use oxygen for aerobic respiration - CORRECT ANSWER - A,B,D
Imagine that a young girl suffers a horseback-riding injury, and one of her ribs punctures her
diaphragm. How will this injury affect the girl's breathing?
A. The injury will make it easier to increase negative air pressure in her chest cavity, making
inhalation easier.
B. The injury will make it more difficult to increase negative air pressure in her chest cavity,
making inhalation more difficult.
C. The injury will make it more difficult to decrease negative air pressure in her chest cavity,
making inhalation more difficult.
D. The injury will not affect her at all, as intercostal muscles are responsible for breathing. -
CORRECT ANSWER -B
Which of the following present challenges that make gas exchange more difficult for fish than
for terrestrial animals? Select all that apply.
A. Water is denser and more viscous than air.
B. Water contains much less O2 than air per unit volume.
C. Gills have less surface area than lungs.
D. Unidirectional flow of water is less efficient than tidal ventilation.
E. Diffusion occurs more slowly in water than in air. - CORRECT ANSWER - A,B,E
In a mammal's bloodstream, where would you expect to find oxygen? Select all that apply.
A. dissolved in blood plasma
B. attached to the heme group of myoglobin in red blood cells
C. attached to the heme groups of hemoglobin in red blood cells
, D. attached to the heme group of myosin in red blood cells
E. dissolved in hemolymph - CORRECT ANSWER - A,C
If the partial pressure of oxygen (pO2) in a man's blood plasma decreased below that in his red
blood cells, what would be the result?
A. More oxygen would diffuse into his red blood cells and be transported throughout his body.
B. Oxygen would diffuse out of his red blood cells, and less oxygen would be transported
throughout his body.
C. The concentration of oxygen would be the same in red blood cells and blood plasma. -
CORRECT ANSWER -B
As fluid moves through a vessel, which factors determine the flow resistance? (Select all that
apply.)
A. the radius of the vessel
B. the pressure exerted by the heart
C. the length of the vessel
D. the viscosity of the fluid - CORRECT ANSWER - A,C,D
In which of the following animals does blood flow directly from respiratory organs to tissues
without first returning to the heart?
A. fish
B. birds
C. amphibians
D. reptiles
E. mammals - CORRECT ANSWER -A
Questions and CORRECT Answers
The respiratory system of which of the following organisms relies on air sacs to move air
through the lungs?
birds
mammals
fish
amphibians
reptiles - CORRECT ANSWER - birds
Which of the following statements is true regarding respiration in mammals?
Select all that apply.
A. Air moves in a unidirectional fashion through the lungs.
B. Gas exchange occurs in the bronchioles.
C. Gas exchange occurs in the alveoli.
D. Respiration depends on changes in air pressure in the chest cavity.
E. Respiration depends on contractions of the diaphragm. - CORRECT ANSWER - C,D,E
Simple multicellular organisms that are small can meet their gas exchange needs by means of:
Select all that apply.
A. a flattened body shape that increases surface area
B. a flattened or thin body shape that reduces the distance between cells inside their body and the
external environment
C. by living in air that provides abundant oxygen, even though they are at risk of losing water
and drying out
,D. by living in water so that they do not dry out from water loss, even though water has less
oxygen per volume than air
E. by relying on anaerobic respiration (glycolysis) for long time periods, so that they don't need
to use oxygen for aerobic respiration - CORRECT ANSWER - A,B,D
Imagine that a young girl suffers a horseback-riding injury, and one of her ribs punctures her
diaphragm. How will this injury affect the girl's breathing?
A. The injury will make it easier to increase negative air pressure in her chest cavity, making
inhalation easier.
B. The injury will make it more difficult to increase negative air pressure in her chest cavity,
making inhalation more difficult.
C. The injury will make it more difficult to decrease negative air pressure in her chest cavity,
making inhalation more difficult.
D. The injury will not affect her at all, as intercostal muscles are responsible for breathing. -
CORRECT ANSWER -B
Which of the following present challenges that make gas exchange more difficult for fish than
for terrestrial animals? Select all that apply.
A. Water is denser and more viscous than air.
B. Water contains much less O2 than air per unit volume.
C. Gills have less surface area than lungs.
D. Unidirectional flow of water is less efficient than tidal ventilation.
E. Diffusion occurs more slowly in water than in air. - CORRECT ANSWER - A,B,E
In a mammal's bloodstream, where would you expect to find oxygen? Select all that apply.
A. dissolved in blood plasma
B. attached to the heme group of myoglobin in red blood cells
C. attached to the heme groups of hemoglobin in red blood cells
, D. attached to the heme group of myosin in red blood cells
E. dissolved in hemolymph - CORRECT ANSWER - A,C
If the partial pressure of oxygen (pO2) in a man's blood plasma decreased below that in his red
blood cells, what would be the result?
A. More oxygen would diffuse into his red blood cells and be transported throughout his body.
B. Oxygen would diffuse out of his red blood cells, and less oxygen would be transported
throughout his body.
C. The concentration of oxygen would be the same in red blood cells and blood plasma. -
CORRECT ANSWER -B
As fluid moves through a vessel, which factors determine the flow resistance? (Select all that
apply.)
A. the radius of the vessel
B. the pressure exerted by the heart
C. the length of the vessel
D. the viscosity of the fluid - CORRECT ANSWER - A,C,D
In which of the following animals does blood flow directly from respiratory organs to tissues
without first returning to the heart?
A. fish
B. birds
C. amphibians
D. reptiles
E. mammals - CORRECT ANSWER -A
