What is the major factor controlling how levers work?
A) the structural characteristics of the muscles of the person using the lever
B) the weight of the load
C) the direction the load is being moved
D) the difference in the positioning of the effort, load, and fulcrum
D) the difference in the positioning of the effort, load, and fulcrum
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Hundreds of years ago, explorers often died of scurvy. How can this bone-related disease be prevented?
A) Supplement the diet with more calcium from meat. B) Increase levels of testosterone to stimulate bone repair. C) Supplement the diet with fresh fruit rich in vitamin C. D) Drink more water to promote bone remodeling and repair. E) Amputate fractured limbs to prevent the spread of scurvy.
After initial entry of bacteria into a cut in the skin, vasodilation of local blood vessels and increased capillary permeability occur. Which of the following events is NOT part of the adaptive immune response to the infection?
A. antigen interaction with lymphocytes B. production of antibodies that bind to antigens C. B-cell differentiation into plasma cells D. vasodilation of local blood vessels E. activation of lymphocytes
The primary kind of motility in the small intestine during digestion of a meal is
A. mass movement. B. receptive relaxation. C. peristalsis. D. migrating motility complex. E. segmentation.
In a sarcomere, the central portion of thick filaments are linked laterally by proteins of the
a. A band. b. Z line. c. M line. d. I band. e. H band.