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The main function of this structure is to regulate the amount of light entering the eyeball through the pupil.

The olfactory tract

This is a thin mucous membrane that protects the inner aspect of the eyelids and the portion of the sclera covering the anterior surface of the eyeball.

How many extrinsic eye muscles are responsible for moving each eye?

When sound waves strike this structure, they cause it to vibrate back and forth.

This structure is a thin semi-transparent partition between the external auditory canal and the middle ear. 

Master gland that secretes at least nine hormones. Enter just the letter into the blank.

Which of the following anterior pituitary hormones stimulates milk production?

The coordinates of a line on a graph are (4, 8). If the line is running horizontally, what is another possible set of coordinates?

Which of the conversions is NOT correct?