Lumbar spinal stenosis refers to:
A) a narrowing of the lumbar intervertebral foramina.
B) a narrowing of the vertebral (spinal) canal in one or more of the lumbar vertebrae.
C) a congenitally restricted dural sheath in the lumbar region.
D) osteoporotic changes in the lumbar bodies that reduce lumbar movements.
E) progressive abnormal shortening of the lumbar spinous processes resulting in extreme lordosis.
Ans: B
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A cell uses centrioles in the process of
A. protein synthesis. B. RNA replication. C. cell division. D. energy generation. E. nuclear centering.
Most colony-stimulating factors are growth factors.
Answer the following statement true (T) or false (F)
Answer the following statements true (T) or false (F)
1. The erectile tissue in the female external genitalia is the mons pubis. 2. The first menses is referred to as menarche. 3. The secretory phase is the part of the female reproductive cycle from ovulation to the beginning of menses. 4. The blood level of estrogen is at its highest during the secretory phase of the female reproductive cycle. 5. The proliferative phase is the part of the female reproductive cycle from the end of menses to ovulation.
If pure water and a solution containing a nonpenetrating solute are separated by a membrane,
a. water will diffuse by osmosis until the concentrations between the two compartments become equal. b. both water and the solute will diffuse across the membrane down their concentration gradients until a state of equilibrium is established. c. water will diffuse by osmosis until stopped by an opposing hydrostatic pressure. d. no movement will take place across the membrane. e. it is impossible to predict what will happen.