Bone cells called ________ break down bone by secreting hydrochloric acid and enzymes that dissolve the matrix.
A. osteocytes
B. osteoprogenitor cells
C. osteoblasts
D. osteoid cells
E. osteoclasts
Answer: E
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What causes RDS (respiratory distress syndrome) in premature babies?
A. Muscles associated with respiration are not strong enough to expand the thorax. B. Respiratory centers of the brain are not functional until late in the fetal stage. C. The lungs have not yet produced adequate numbers of alveoli for efficient gas exchange. D. There is insufficient production of surfactant. E. Bronchioles are constricted due to excess production of mucus.
Cells in the pancreas that secrete glucagon and insulin are which of the following?
(a) A and B cells (b) acinar cells (c) D cells (d) pancreatic D1 cells (e) pancreatic polypeptide cells
The styloid process of the radius can be palpated proximal to the thumb
Indicate whether the statement is true or false
When physical exertion has ended and the body is at rest, veins demonstrate
A. vasoconstriction so that blood is shifted toward the rest of the circulatory system. B. vasodilation so that blood is shifted toward the rest of the circulatory system. C. vasodilation so that they function as blood reservoirs. D. vasoconstriction so that they function as blood reservoirs.