What cells are responsible for the body's immune system?
a. erythrocytes
b. thrombocytes
c. pathogens
d. plasmids
e. leukocytes
e
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Which of the following statements about bone remodeling and repair is correct?
A. Bone remodeling does not involve the activity of the osteoclasts and the osteoblasts. B. As a long bone increases in diameter, the size of the marrow cavity decreases. C. The rate of bone remodeling increases in the elderly. D. Bone remodeling involves removal of old bone by osteoblasts. E. Exposure of a bone to increased mechanical stress can lead to bone remodeling.
Which of the following is part of the upper respiratory tract?
A. Bronchi B. Pharynx C. Lungs D. Bronchioles E. Trachea
The adult spinal cord extends inferiorly from the brain through the vertebral canal and ends at the level of the ________ vertebra.
A. L6 B. S4 C. S1 D. T8 E. L1
Which are the midbrain nuclei that produce dopamine, and thereby affect motor control?
A. Red nuclei B. Substantia nigra C. Cerebral nuclei D. Arcuate nuclei