This condition involves progressive demyelination of neurons in the CNS accompanied by the destruction of oligodendrocytes. As a result, the conduction of nerve impulses is disrupted, leading to impaired sensory perception and motor coordination.
A. Parkinson disease
B. Amyotrophic lateral sclerosis
C. Guillain-Barré syndrome
D. Multiple sclerosis
E. None of the choices is correct.
Answer: D
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Immune surveillance is a process in which ________ nonspecifically detect and destroy foreign cells and diseased host cells.
A. dendritic cells B. T lymphocytes (T cells) C. natural killer (NK) cells D. macrophages E. reticular cells
Before the discovery of these glands, thyroid surgery often led to a rapid drop in blood calcium levels, which triggered muscle contractions and cardiac arrhythmias. What glands are these and which hormone is lacking?
A) thyroid glands; calcitonin B) parathyroid glands; calcitonin C) parathyroid glands; parathyroid hormone D) thyroid glands; levothyroxine E) parathyroid glands; levothyroxine
Which of the following is not a derivative of ectoderm?
A) Salivary glands B) Cutaneous glands C) The nervous system D) The dermis E) The epidermis
Negative feedback inhibition occurs when
a. thyroxine stimulates the anterior pituitary. b. TRH stimulates the thyroid gland. c. TSH stimulates the thyroid gland. d. TRH stimulates the anterior pituitary. e. TRH causes the anterior pituitary to release TSH.