In ____, the spinal cord is encased in an external sac, most often in the area of the lumbar spine or sacrum.

Which of the following would be the best way to write "four tenths of a milligram" in order to avoid medication errors?

40 mg 0.4 mg 4.0 mg .4 mg

Electrical impulse sensors placed on the body that detect and record the electrical activity of the heart are ________.

Fill in the blank(s) with the appropriate word(s).