Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
What maintains stable internal conditions in the body despite changes in the external environment?
equilibrium
homeostasis
negative feedback
positive feedback
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What detects stimuli and signals the brain about changes in the internal environment?
receptors
organisms
effectors
coordinators
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Muscles or glands that act on signals from the brain to elicit responses are known as:
effectors
stimuli
coordinators
receptors
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Negative feedback systems work to maintain conditions around:
set optimum points
midpoints
minimum points
maximum points
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How does negative feedback reverse changes in the internal environment?
by maintaining external conditions
by detecting changes and producing responses in the opposite direction
by intensifying changes until equilibrium is disrupted
by signalling between adjacent cells only
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Which of the following is NOT an example of negative feedback?
temperature regulation
glucose regulation
maintaining blood pH
blood clotting
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Positive feedback differs from negative feedback in that it:
reverses changes
maintains equilibrium
occurs between adjacent cells only
amplifies changes
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Why is tight regulation essential for positive feedback systems?
to reverse changes completely
to maintain external equilibrium
to enable communication between close cells
to prevent uncontrolled responses disrupting the body
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Which statement about cell signalling is FALSE?
it enables communication between cells
it only occurs between adjacent cells
signals can travel in the blood
cell surface receptors are involved
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Negative feedback and positive feedback differ in that:
positive feedback relies on cell signalling but negative feedback does not
negative feedback enhances changes while positive feedback reverses them
negative feedback restores equilibrium while positive feedback intensifies change
positive feedback is involved in homeostasis but negative feedback is not
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