In a negative feedback loop, what happens to a variable when it increases past its normal range? O It continues to increase It decreases until it's much lower than the normal range It does not change It decreases until back to the normal range
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- Which of this statement is INCORRECT regarding the function of hormones?a) Reproduction and sexual differentiationb) Maintenance of internal environmentc) Maintain body temperatured) Development and growthWhat does negative feedback do? a. It establishes a set point. b. It changes the set point. c. It eliminates the set point. d. It reduces discrepancies from a set point.In a negative feedback mechanism,a. the output cancels the input.b. there is a fluctuation above and below the average.c. there is self-regulation.d. a regulatory center communicates with other body parts.e. All of these are correct.
- Draw a row diagram showing the relationships among the components of a negative-feedback control system.Which of the following terms does A counteracting response, or being inversely proportional to the stimulus belong to? a.)Control center b.)Homeostasis c.)Stimulus-response model d.)Negative feedback e.)Positive feedback f.)Feedback modelWhich of the following is not true for f negative feedback loops? A. In a negative loop, the response to the signal or stimulus decreases the original signal or stimulus. B. Negative feedback loops maintain homeostasis. C. Negative feedback loops are temporary. D. There are many more instances of negative feedback loops in the human body than positive feedback loops.
- a positive-feedback system is one in which a. a variable is charged in the opposite direction to the original change that initiated the system b. a variable is changed in the same direction as the original change that initiated the system c. two opposiding variables are played against each other d. the initiating variable is always increasedIn negative feedback, the variable being regulated is changed in the ______ direction, while in positive feedback the variable is changed in the ______ direction. A. same, opposite B. negative, positive C. opposite, same D. decreasing, increasingChoose all that apply
- 1. What is homeostasis? a. Fluctuation between high and low valuesb. Ingestion of enough food to satisfy hungerc. Tendency of the body to maintain a stable internal environmentd. Ability to remain within certain limited ranges 2. How does negative feedback lead to homeostasis? a. It shuts off the original stimulus, or reduces its intensity.b. It amplifies the effect of stimulusc. Increasing the effect of an output 3. Which statement about positive feedback is false? a. Positive feedback is observed more readily than negative feedback.b. Positive feedback reaches a limit at which it terminates quickly.c. Positive feedback amplifies the response.d. Positive feedback is exemplified by sexual behavior. 4. As fruit ripens it emits a chemical called ethylene, which attracts fruit flies. The flies damage the fruit, causing more odor to be released. As this happens, more flies are attracted to the fruit. Of what response is this an example?a. Positive feedbackb. Negative feedbackc.…In general, animal behaviors arise from an interactionbetween the animal’s__________ and its_______. Some behaviors are performed correctly the first time an animal encounters the proper______ .Such behaviors are described as_________ .Which of these homeostatic mechanisms in the body are examplesof positive feedback, and which are examples of negative feedback?Why?a. The adrenal glands produce epinephrine in response to a hormone produced by the pituitary gland in times of stress; the pituitary gland senses the epinephrine in the blood and stopsproducing the hormone.b. As the bladder fills with urine, pressure sensors send messagesto the brain with increasing frequency, signaling that the bladdermust be emptied. The more the bladder fills, the more messagesare sent.c. When you drink an excess of water, specialized cells in yourbrain, as well as stretch receptors in your heart, detect theincrease in blood volume. Both signals are transmitted to thekidneys, which increase the production of urine.