The heart valve guarding the entrance to the aorta is the ________ valve.
Fill in the blank(s) with the appropriate word(s).
aortic semilunar
The heart valve guarding the entrance to the aorta is the aortic valve.
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A couple visits a fertility clinic to determine the basis of their difficulty in conceiving a child. They are surprised to hear they will both be tested for levels of two of the same hormones, which play roles in the ovarian cycle and sperm production. Which hormones are they?
A. adrenocorticotropic hormone (ACTH) and corticotropin-releasing hormone (CRH) B. insulin and glucagon C. oxytocin and luteinizing hormone (LH) D. follicle-stimulating hormone (FSH) and luteinizing hormone (LH) 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 sex hormones? 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?
Which of the following is a consequence of human population growth?
a. reduction in life expectancy b. increased density-dependent growth factors c. degradation of the natural environment d. reduced urbanization
Citric acid makes lemons taste sour. Which of the following is a functional group that would cause a molecule like citric acid to be acidic?
A. hydroxyl B. carboxyl C. carbonyl D. hydrocarbon
Gills are unsuitable for animals living on land because
A) the large external surface area of gills would allow dehydration of the animal. B) air cannot diffuse across the gill surface. C) there is no way to get air into the gills. D) gills require high blood pressure.