Which of the following can cause amenorrhea? Select all that apply.
A. Low body fat
B. Abstinence
C. Hyposecretion of gonadotropin
D. Pregnancy
Answer: D
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Which of the following is a benefit of using phosphocreatine to store energy (as compared to ATP)?
A) Phosphocreatine can be used by almost any process requiring an input of energy. B) Phosphocreatine can diffuse more easily to areas needing energy. C) Phosphocreatine allows muscles to stop using ATP, conserving it for other uses. D) Phosphocreatine is produced during periods of high muscle activity.
The normal sequence of developmental stages is
a. blastocyst, morula, zygote, embryo, fetus b. blastocyst, zygote, embryo, morula, fetus c. morula, fetus, embryo, blastocyst, zygote d. morula, zygote, fetus, blastocyst, embryo e. zygote, morula, blastocyst, embryo, fetus
Suppose that an individual injects himself with erythropoietin in order to raise his level of endurance, an act that is usually illegal in competitive sports. Which of the following could result?
A. decreased blood viscosity B. a lower hematocrit C. polycythemia D. reduced tendency for blood to clot
What effects can be attributed to increased pressure on a bone?
A. increased osteoclast activity B. increased osteoblast activity