How do the varieties of pain sensations differ from one another?
What will be an ideal response?
Pain sensations are of two types, fast pain and slow pain. Fast, or prickling, pain is produced by such problems as
deep cuts or injuries. These sensations reach the CNS quickly and are often relayed to the primary sensory cortex to receive conscious attention. Sensations of slow pain, or burning and aching pain, result from the same types of injuries as fast pain sensations but begin later and persist longer. These cause a generalized activation of the reticular formation and thalamus and give a general sensation of the pain, but not a good localization of it.
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Proteins of the plasma membrane carry out all of the following functions except
A) binding to DNA to turn on genes. B) sending and receiving signals to and from other cells. C) transporting substances across the membrane. D) anchoring the cell to external structures. E) catalyzing chemical reactions at the inner or outer surface of the membrane.
Which of the following occurs when the articular cartilage is damaged?
A) The matrix begins to break down. B) The exposed surface appears rough. C) Friction in the joint increases. D) Normal synovial joint function is unable to continue. E) All of the answers are correct.
What prevents the dramatic increase in venous return that occurs during exercise from damaging the cardiac myocytes?
A. The exercise demand on the heart causes it to stiffen, preventing overstretch. B. The pericardium acts as a limit on the amount of stretch. C. The increased heart rate limits filling time. D. Venous return is not sufficient to stretch the heart very much.
What artery supplies the small intestine, cecum, ascending colon, and transverse colon?
A. inferior phrenic artery B. lumbar artery C. superior mesenteric artery D. inferior mesenteric artery