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 synthesis of bone matrix glycosaminoglycans (GAGs).
C. It stimulates osteoblast activity.
D. It promotes the cross-linking of collagen molecules.
E. It is necessary for calcium absorption by the small intestine.
Answer: B
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Baby Timothy suffers from apnea and is hooked up to a monitor to warn his parents when he stops breathing. Timothy's dad snores very loudly. Timothy's condition differs from his father's in that infant apnea is
A. due to airway obstruction. B. treated by strapping a device onto the nose at night. C. a result of decreased surfactant. D. a central problem of respiratory control.
The adrenal medulla secretes ____________________.
mineralocorticoids Androgens Cortisol and Cortisone Aldosterone None of the choices are correct
Hal's True Hardware Stores and Ideal Tools, Inc., sign a written contract for a sale of goods. To be enforceable, this written contract must include
a. a correct title, such as "Purchase Order" or "Sales Invoice." b. a date, such as "October 2014" or "10/2014." c. a quantity term, such as "50 hammers" or "100 boxes of assorted nails." d. the parties' contact information.
An increase in the partial pressure of CO2 causes bronchioles to
A. constrict. B. dilate.