Compare and contrast MRIs, PET scans, and fMRI.
What will be an ideal response?
The MRI measures variations in magnetic fields. It then computes and depicts cross sections of organs such as the brain with great clarity. It is noninvasive and allows for visualization of all but the tiniest brain structures. Its major problem is the claustrophobic reaction some people have to the procedure. PET scans track substances as they are metabolized by the brain. They can show how the brain is functioning-and they can help identify areas that are functioning abnormally, even in ways that might not be obvious anatomically. Their major problem is their low-fidelity pictures, which have so far limited their value. The fMRI measures changes in blood flow in the brain. It is possible to map ongoing psychological activity and show which areas of the brain are involved in different activities. However, like MRIs, these are very sensitive to movement, which can cause false results. Also, fMRIs are often very hard to interpret. GRADING RUBRIC: 6 points, 2 for accurately describing each imaging technique.
You might also like to view...
Zahaire just learned she has an upper respiratory bacterial infection. Explain how Zahaire's immune system will likely respond to the infection.
What will be an ideal response?
Susan is talking to her friend, who is at the end of her second trimester. Lucila wants to be reassured that she is not crazy, but thinks her baby actually kicks, turns, and hiccups
Lucila even thinks that the baby becomes more active if she talks to it. If you were Susan, how would you respond to Lucila's observations? a. "Lucila, those activities are normal for the end of the second trimester, and fetuses can hear even in the womb." b. "Lucila, I think you are going crazy. A fetus really doesn't kick that early in the pregnancy and it's crazy to think it can hear." c. "Lucila, all those things do happen, but not really until the end of the third trimester." d. "Lucila, I think you need to go see your doctor because something is absolutely wrong."