Match the trade barrier to the example it describes.

Letter F on the figure indicates the [OPT1].

The [OPT1], shown at letter G in the figure, controls the size of the pupil.

Letter J on the figure identifies the [OPT1].

The [OPT1], shown at letter I in the figure, controls the amount of light that enters the eye.

Letter G on the figure shows the [OPT1].

Hair follicles are designated by the letter ________ in the figure.

When the thyroid gland does not produce adequate amounts of thyroid hormones, a condition called ________ may result.

Which type of bone is primarily located in the skull and rib cage?

Letter A in the figure indicates the pinna, or [OPT1], which is part of the external ear.