Divisions of the cerebral hemispheres that are named after the overlying skull bones are
A) fissures.
B) sinuses.
C) lobes.
D) sulci.
E) gyri.
C
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What is the role of vitamin A in bone deposition?
A. It provides the raw material for calcification of the ground substance. B. It promotes the cross-linking of collagen molecules. C. It is necessary for calcium absorption by the small intestine. D. It promotes the synthesis of bone matrix glycosaminoglycans (GAGs). E. It stimulates osteoblast activity.
Epithelial cells that are adapted for moving material along their apical surface usually have
A) many mitochondria. B) cilia. C) microvilli. D) Golgi complexes. E) junctional complexes.
Cells in the stratum basale that are used as sensory receptors are called
A) Langerhans' cells. B) Merkel cells. C) melanocytes. D) stem cells. E) keratinocytes.
What is the function of histamine?
A. It is a vasodilator that speeds blood flow to injured tissues. B. It is a chemical that kills bacteria. C. It is a clotting factor. D. It is a signal to B cells to produce antibodies. E. It is an anticoagulant that inhibits blood clotting.