For individuals, achieving a healthy body weight for life depends mainly on
A. access to health care.
B. environment.
C. economic status.
D. lifestyle.
Answer: D
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Causes of _____ include heredity, poor dietary habits, inadequate fiber, overuse of laxatives, and lack of exercise
A) flatus B) hemorrhoids C) proctoscope D) prolapse
Why does neuromuscular transmission fail in myasthenia gravis? Choose the correct option
A) Autoantibodies interfere with the synthesis of acetyl choline B) Autoantibodies interfere with the function of nicotinic ACh receptors at the neuromuscular junction C) Autoantibodies interfere with the amount of acetylcholine esterase at the neuromuscular junction D) Autoantibodies interfere with the release of synaptic vesicles at the neuromuscular junction
Thymocytes that are not positively selected
a. undergo genetic reprogramming and differentiate into a different cell type b. are exported to the periphery, where they are phagocytosed by macrophages c. make up about 98% of developing thymocytes and die by apoptosis in the thymic cortex d. are eliminated because of their reactivity with self antigens e. try out different ? chains to acquire reactivity with self-MHC molecules.
Which heavy metal is found in the Earth's crust, has widespread industrial applications including battery manufacturing, and causes learning problems and lower I.Q. scores with high-level exposure in children?
a. mercury b. selenium c. lead d. cadmium