Question 1

Which part of a hemoglobin molecule binds to a molecule of O2?

Accepted Answer

A)  the hydrophobic pocket between two  α\alphaα  chains
B)  the copper atom wedged between an  α\alphaα  and a  β\betaβ  globin chain
C)  the iron atom in the center of a heme group
D)  the surface of a  β\betaβ globin chain E) B) and D)
F) B) and C)

Question 2

Tom is choking on a piece of steak that is stuck in his trachea, and he signals for his young son to call 911.It takes the paramedics four minutes to reach his house.Will this be in time to save Tom (and why) , or will Tom already be dead (and why) ?

Accepted Answer

A)  Tom will be alive since the myoglobin in his muscles will release oxygen into the blood after he stops breathing.
B)  Tom will be dead due to the lowered pH of his blood.
C)  Tom will be dead since all the hemoglobin in his arterial blood will unload its oxygen during the first pass through the tissues after his last breath.
D)  Tom will be alive since he had a reserve of about three-quarters of his hemoglobin still bound to oxygen when he started choking.E) A) and D)
F) B) and C)

Question 3

The general term that describes the uptake of oxygen from the environment and the disposal of carbon dioxide at the body system level is

Accepted Answer

A)  respiration.
B)  diffusion.
C)  exhalation.
D)  cellular respiration.E) B) and D)
F) A) and C)

Question 4

Protruding papulae on the surface of echinoderms improve respiratory efficiency by ______.

Accepted Answer

A)  increasing the concentration difference
B)  increasing the surface area for diffusion
C)  decreasing the distance for diffusion
D)  changing the diffusion constantE) C) and D)
F) A) and B)

Question 5

The close proximity of capillaries to the alveoli in lungs improve respiratory efficiency by ______.

Accepted Answer

A)  decreasing the distance for diffusion
B)  changing the diffusion constant
C)  increasing the concentration difference
D)  increasing the surface area for diffusionE) A) and D)
F) B) and C)

Question 6

Fish and crustaceans are similar in that both use _____________ for gas exchange.

Accepted Answer

A)  tracheal tubes
B)  gills
C)  the walls of the mantle cavity
D)  the moist surface of their skinE) B) and C)
F) None of the above

Question 7

Which dissolved gas cannot be transported by hemoglobin?

Accepted Answer

A)  oxygen (O2) 
B)  nitrogen (N2) 
C)  nitric acid (NO) 
D)  carbon monoxide (CO) E) A) and D)
F) C) and D)

Question 8

One possible reason that there are not any really large insects currently living on Earth is that

Accepted Answer

A)  gas exchange across their moist skin surfaces cannot support the metabolic needs of a large body.
B)  they do not have as many papulae as echinoderms.
C)  their gills do not have as many lamellae as fish gills.
D)  the bulk flow of air through their tracheal tubes would be more difficult the larger the body and longer the tracheal tubes.E) All of the above
F) A) and C)

Exam 48: The Respiratory System

Which part of a hemoglobin molecule binds to a molecule of O₂?

Correct Answer
verified

The general term that describes the uptake of oxygen from the environment and the disposal of carbon dioxide at the body system level is

Correct Answer
verified

Tom is choking on a piece of steak that is stuck in his trachea, and he signals for his young son to call 911.It takes the paramedics four minutes to reach his house.Will this be in time to save Tom (and why) , or will Tom already be dead (and why) ?

Correct Answer
verified

One possible reason that there are not any really large insects currently living on Earth is that

Correct Answer
verified

Protruding papulae on the surface of echinoderms improve respiratory efficiency by ______.

Correct Answer
verified

The close proximity of capillaries to the alveoli in lungs improve respiratory efficiency by ______.

Correct Answer
verified

Fish and crustaceans are similar in that both use _____________ for gas exchange.

Correct Answer
verified

Which dissolved gas cannot be transported by hemoglobin?

Correct Answer
verified

Exam 48: The Respiratory System

Which part of a hemoglobin molecule binds to a molecule of O2?

Correct AnswerverifiedShow Answer

The general term that describes the uptake of oxygen from the environment and the disposal of carbon dioxide at the body system level is

Correct AnswerverifiedShow Answer

Tom is choking on a piece of steak that is stuck in his trachea, and he signals for his young son to call 911.It takes the paramedics four minutes to reach his house.Will this be in time to save Tom (and why) , or will Tom already be dead (and why) ?

Correct AnswerverifiedShow Answer

One possible reason that there are not any really large insects currently living on Earth is that

Correct AnswerverifiedShow Answer

Protruding papulae on the surface of echinoderms improve respiratory efficiency by ______.

Correct AnswerverifiedShow Answer

The close proximity of capillaries to the alveoli in lungs improve respiratory efficiency by ______.

Correct AnswerverifiedShow Answer

Fish and crustaceans are similar in that both use _____________ for gas exchange.

Correct AnswerverifiedShow Answer

Which dissolved gas cannot be transported by hemoglobin?

Correct AnswerverifiedShow Answer

Which part of a hemoglobin molecule binds to a molecule of O₂?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified