Which of the following is not a bone making up the bony orbit?

To remove or undress; especially used when referring to sterile (scrub) attire.

Which of the following two terms measures physiological activity during sleep? 

A specific technique for cleaning the hands and arms before donning sterile surgical gown and gloves just before surgery. This is performed with timed or counted strokes using detergent-based antiseptic. This removes dirt, oils, and transient microorganisms and reduces the number of resident microorganisms.

Which of the following can only be observed by the patient such as pain?

Which of the following is not a valve controlling the flow of blood through the heart? 

Which of the following is not a main function of the lymphatic system?

Any item or medical device that has been exposed to a process that destroys all microbes, including spores.

Which of the following is a sudden, violent, involuntary contraction of one or more muscles? 

The transfer of microbes to an item or tissue by direct physical contact with the microbes.