The North American pronghorn antelope can run almost as fast as a cheetah, but unlike the cheetah, can also sustain speeds of 30-40 mph for miles. The pronghorn is about the size of a large, domestic goat. You would predict the antelope to have a _____ than the goat.
A. smaller trachea
B. higher concentration of hemoglobin
C. smaller lung volume
D. lower concentration of myoglobin
E. lower concentration of bicarbonate
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about oxygen use? What other information is related to the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
B. higher concentration of hemoglobin
Clarify Question
What is the key concept addressed by the question?
· This question is asking you to identify the physiological basis for sustained running.
What type of thinking is required?
· Apply level:
o You are being asked to take what you already know and use, or apply, it to explain the sustained running speed of a large mammal.
Gather Content
What do you already know about oxygen use? What other information is related to the question?
· Cellular respiration provides the energy that is necessary for all activities, including running.
· Oxygen is necessary for cellular respiration to occur.
· Oxygen binds to hemoglobin and is transported to cells through the circulatory system.
· Myoglobin binds to oxygen and stores in muscle tissue.
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
· A smaller lung volume and a smaller trachea would reduce the available oxygen, and subsequently the potential for more cellular respiration.
· A lower concentration of myoglobin would also reduce available oxygen.
· Bicarbonate is a molecule that transports carbon dioxide; it is not involved in making oxygen available for cellular respiration.
· A higher concentration of hemoglobin would increase the amount of oxygen that could be transported to cells, and thereby the amount of energy available for activity.
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
· Apply level:
o Answering this question correctly depended on your ability to use the nature of energy that is available for use in a new situation. If you got an incorrect answer, did you remember that oxygen is required to produce usable cellular energy, or that hemoglobin carries oxygen? Did you have trouble extending the requirements for cellular respiration to determine the correct answer?
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