Baroreceptors notify the brain that the blood pressure has increased. The brain then notifies the blood vessels to dilate, thus lowering the blood pressure. Then baroreceptors notify brain that blood pressure has lowered thus blood vessels no longer dilate.
A) This is a negative feedback loop because having too many platelets in one area blocks blood flow.
B) This is a positive feedback loop because the response prevents a person from hemorrhaging to death. .
C) This is a positive feedback loop because the response reinforces the initial change.
D) This is a negative feedback loop because the response opposes the initial stimulus.
E) This is a neutral feedback loop because the positive and negative effects cancel each other.
Ans: D) This is a negative feedback loop because the response opposes the initial stimulus.
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A patient is born with several autoimmune diseases and severe allergies. This patient most likely has a deficiency of ________.
A. helper T cells B. regulatory T cells C. plasma cells D. cytotoxic T cells
Answer the following statements true (T) or false (F)
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For the class as a whole, which condition would you expect to display the shortest average reaction time?
A. Random interval, dominant hand B. Fixed interval, dominant hand C. All 4 of the conditions tested showed the same reaction times. D. Random interval, non-dominant hand E. Fixed interval, non-dominant hand