The hardness of a nail comes from

A. collagen.
B. keratin.
C. calcium.
D. carotene.


Answer: B

Anatomy & Physiology

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How many globins (protein building blocks) are found in a single hemoglobin molecule?

A.   1 B.   2 C.   4 D.   6 E.   8

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The lungs develop from

A. an evagination from the floor of the diencephalon. B. an invagination from the hindgut. C. an evagination from the foregut. D. somitomeres. E. neural crest cells.

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The cornea is relatively easy to transplant because

A. it has an extensive blood supply. B. its high immunological activity prevents infection. C. it is not attached to the eye. D. its proteoglycan content is high. E. it is easy to access and is avascular.

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name the attachments of the orbicularis oculi. select all that apply.

a) maxilla just below infraorbital foramen b) eyelids; skin around margin of orbit c) zygomatic arch; fascia near ear d) lacrimal bone; medial angle of eyelid

Anatomy & Physiology