In the human body, bicarbonate and carbonate ions work together to stabilize or buffer the pH of body fluids. What would happen to blood if these buffering agents were removed?
What will be an ideal response?
Blood pH could not be regulated in the absence of this buffering pair. Anything absorbed or released from body fluids that altered the hydrogen or hydroxyl ion content of blood would cause a pH change. For humans who tightly regulate homeostasis, even relatively modest changes in blood pH can have devastating consequences.
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In mammals, most gas exchange between the atmosphere and the pulmonary blood occurs in the _____
A) trachea B) larynx C) bronchi D) bronchioles E) alveoli
A microbiologist suspects a strain of Staphylococcus aureus is resistant to methicillin. What would be the best approach to test this suspicion?
A. Perform a Gram stain. B. Sequence the chromosome looking for resistance genes. C. Calculate the doubling time for the bacteria. D. Inject the bacteria into a host animal and look for disease symptoms. E. Add methicillin to the growth plates. 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 antibiotic resistance? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
About how many million years ago did humans of the genus Homo first inhabit eastern Africa?
a. 2 b. 4 c. 6 d. 8 e. 10
Which part of the respiratory system is an air tube held open by a series of C-shaped cartilaginous rings?
A. trachea B. bronchioles C. pharynx D. larynx