14. All of the following are advantages of fMRI over PET imaging EXCEPT: A) fMRI is a noninvasive procedure and the magnetic waves are harmless, allowing research participants to undergo repeated fMRI scans.

B) fMRI produces a sharper image than PET scans and therefore can detail much smaller brain structures.

C) fMRI provides a picture of brain activity averaged over seconds rather than the several minutes required by PET scans.

D) fMRI involves the use of smaller amounts of radioactively tagged glucose or oxygen than does PET.

What is the difference between drug misuse and drug abuse?

To avoid whiplash, the center of the headrest must be your ears.

Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.