Wasserman_BILD2_SampleMidtermII - BILD2 WI06 Midterm II 1....

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BILD2 WI06 Midterm II 1. If a cancerous human thyroid is removed surgically, it is important to determine if any thyroid cells remain. In one method, the doctor feeds the patient radioactive iodine. The radioactivity becomes concentrated in the thyroid, enough so to generate an image of the thyroid on film. a. Why is iodine concentrated in the thyroid (10 pts)? To enhance the detection of any thyroid cells remaining, doctors sometimes inject thyrotropin a few days before the patient is given radioactive iodine. b. What is another name for thyrotropin and what is the normal role of this substance in the body (10 pts)? c. What organ normally produces thyrotropin and how is thyrotropin production or release regulated (15 pts)? d. Why would thyrotropin injection increase the amount of iodine concentrated in thyroid cells (15 pts)? 2. IVF (in vitro fertilization) is a method of assisted reproduction. In one type of IVF, an egg is collected surgically just before it would normally be released from the ovary; sperm are collected from the man as they are released from the body (ejaculated). The sperm and the egg are then combined in a laboratory dish, where fertilization occurs. Soon thereafter an embryo, consisting of two to four cells, is transferred in fluid through the cervix to the woman's uterus. a. Every one of the listed events must be timed to the woman's hormonal cycle. Explain why this
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Wasserman_BILD2_SampleMidtermII - BILD2 WI06 Midterm II 1....

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