Which of the following statements regarding calcium homeostasis is true?
A. When blood calcium levels are too low, osteoclast activity increases.
B. Parathyroid hormone increases calcium loss from the kidney.
C. Increased osteoblast activity increases blood calcium levels.
D. Calcitonin elevates blood calcium levels.
E. Parathyroid hormone inhibits osteoclast activity.
Answer: A. When blood calcium levels are too low, osteoclast activity increases.
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Which of the following is not true regarding rheumatoid arthritis?
A. It is associated with rheumatoid factor (an autoantibody). B. It affects 85% of people older than 70. C. It may lead to ankylosis. D. The synovial membrane thickens. E. The articular cartilage degenerates.
A person touches you lightly with a feather. What two areas of the brain allow you to feel and interpret this touch?
A) primary motor cortex and the primary sensory cortex B) primary sensory cortex and the somatic sensory association area C) primary sensory cortex and the visceral sensory association area D) primary motor cortex and the somatic motor association area E) gustatory cortex and the gustatory association area
_________ release endogenous pyrogens in the body
a. Muscle cells b. Pathogens c. Platelets d. Erythrocytes e. Macrophages
A patient's karyotype indicates a chromosome number of 45. This result is best explained by
A. nondisjunction in either the sperm cell or oocyte. B. fertilization of a single oocyte by two sperm cells. C. a point mutation that caused one or more chromosomes to fuse. D. nondisjunction in both the sperm cell and oocyte.