Oral contraceptives work by _____

a. changing the pH of the uterus so sperm cannot live
b. changing the temperature of the uterus so sperm cannot live
c. blocking the entrance to the uterus
d. killing sperm
e. preventing ovulation


ANSWER: e

Biology & Microbiology

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If each human lung contains about 300 million alveoli with a summed total surface area for gas exchange of 40 square meters, what is the approximate surface area of a single alveolus?  

A.  0.133 square micrometers B.  7.5 square micrometers C.  750 square micrometers D.  1.33 square micrometers E.  133 square millimeters F.  7.5 square millimeters 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 alveoli? 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?

Biology & Microbiology

Which of the following correctly describes the order of events that occur when you touch a very hot

surface? 1) action potential 2) stimulus 3) receptor potential 4) transduction into electrical energy a. 1 ? 3 ? 4 ? 2 b. 2 ? 1 ? 4 ? 3 c. 2 ? 4 ? 3 ? 1 d. 4 ? 1 ? 3 ? 2 e. 3 ? 1 ? 4 ? 2

Biology & Microbiology

Gastric Bypass

What will be an ideal response?

Biology & Microbiology

The parietal bone of the skull could arise from any of the following structures, EXCEPT

A. Branchial Arches B. Pharyngeal Arches C. Sclerotome D. Somites E. Somitomeres

Biology & Microbiology