Which statement best describes the receptive field?
A. The ability of each neuron in the skin to detect a stimulus in a given area
B. The ability of the brain to detect different levels of intense sensation
C. The ability of the receptor to have various durations of the sensation
D. The brain's ability to distinguish between different types of sensations
Answer: A
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The conduction velocity of a nerve impulse is slower in myelinated fibers than in unmyelinated fibers because myelin acts as an insulator that slows down the flow of current
Indicate whether the statement is true or false
A point of convergence for several muscles of the lower face is the ________.
A. aponeurotica B. nuchal line C. galea D. modiolus E. retinaculum
Almost immediately following a compound fracture of the femur in an automobile accident, an otherwise healthy patient suffered severe respiratory distress and died. The most likely cause of death was:
A) loss of blood. B) infection. C) pulmonary fat embolism. D) sympathetic overactivity. E) myocardial infarction.
Match the cell type with its description.
1. These are the most abundant leukocyte; they are formed in the bone marrow. 2. Cytotoxic, these cells are associated with allergic reactions and parasitic infestations. Usually these cells are less than 3% of the leukocyte population, and only live up to 12 hours. 3. Precursors of macrophages, these cells are relatively rare in blood because they are actually in transit to some other site. 4. These cells are related to mast cells, and both release chemical mediators such as histamine and heparin, which aid in the immune response. 5. Estimated to reach populations of one trillion in normal adults, most of these cells reside in the lymphoid tissues of the body. These cells look quite similar to one another under the microscope, yet function very differently. A. lymphocytes B. neutrophils C. monocytes D. eosinophils E. basophils