Lecture20: Gas Exchange

Question 1

1. What gasses are most organisms concerned with
   exchanging?
   A. Oxygen and methane
   B. Carbon dioxide and nitrogen
   C. Oxygen and carbon dioxide
   D. Nitrogen and oxygen

Answer 1

C. Oxygen and Carbon Dioxide

Question 2

2. The pressure exerted by one gas in a mix is called:
   A. Partial pressure
   B. Total pressure
   C. Specific gas pressure
   D. Boiling point

Answer 2

A. Partial Pressure

Question 3

Fish gills are efficient as they remove what
percentage of oxygen from the water?
A. 100%
B. 25%
C. >80%
D. 75%

Answer 3

C. >80%

Question 4

What is a major different between bird and mammal
breathing?
A. Mammals are unidirectional with no mixing
B. Birds are unidirectional with no mixing
C. Birds do not exchange CO2 but store and excrete it
D. Birds do not exchange O2 but store and excrete it
through a special gland

Answer 4

B. Birds are unidirectional with no mixing

Question 5

Plants living in dry climates have what gas exchange
adaptation that is different than other plants?
A.They take up O2 at night and store it for use in the day
B. They take up CO2 during the day and store it for use at
night
C. They take up CO2 at night and store it for use in the day
D. They take up O2 during the day and store it for use at
night

Answer 5

C. They take up CO2 at night and store it for use in the day

Question 6

In mammals, where does most gas exchange between the atmosphere and the pulmonary blood occur?

A) larynx

B) bronchi

C) alveoli

D) bronchioles

E) trachea

Answer 6

C) alveoli

Question 7

What is the exhalation of air from human lungs driven by?

A) a decrease in the residual volume of the lungs

B) the expansion of the rib cage

C) the closure of the epiglottis

D) a decrease in the volume of the thoracic cavity

E) the contraction of the diaphragm

Answer 7

D) a decrease in the volume of the thoracic cavity