Which of the following is an example of positive feedback? A rise in body temperature triggers sweating, lowering body temperature toward the set point. O A drop in blood pressure causes the heart to beat more strongly, bringing blood pressure back to the set point. O In response to a messy room, Jordan picks up his mess. During shock, a fall in blood pressure weakens the heart because it receives less blood flow and oxygen, which causes the heart to pump more weakly, further lowering blood pressure below healthy levels

Which of the following is an example of positive feedback? A rise in body temperature triggers sweating, lowering body temperature toward the set point. O A drop in blood pressure causes the heart to beat more strongly, bringing blood pressure back to the set point. O In response to a messy room, Jordan picks up his mess. During shock, a fall in blood pressure weakens the heart because it receives less blood flow and oxygen, which causes the heart to pump more weakly, further lowering blood pressure below healthy levels

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter4: Tissues, Organs, And Organ Systems

Section: Chapter Questions

Problem 8SQ: In______, physical and chemical aspects of the body are being kept within tolerable ranges by body...

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In______, physical and chemical aspects of the body are being kept within tolerable ranges by body are being kept within tolerable ranges by controlling mechanisms. a. Positive feedback b. Negative feedback c. Homeostasis d. metastasis
Which of the following best describes an example of negative feedback? The body starts shivering to generate heat when you detect you are too warm. The feeling of hunger after you've just had a big meal. The increase in breathing rate when the body detects you are low on oxygen and high on CO2. A decreased heart rate in response aerobic exercise. The body sweating when the temperature gets too cold.
Which of the following is an example of negative feedback? A. High blood sugar will increase the viscosity of blood plasma (plasma is concentrated). In response, water is drawn into the plasma from surrounding tissues in order to dilute the plasma B. Breathing rate increases during exercise to provide more oxygen to muscle cells. Heart rate also increase to increase the speed at which the oxygen is delivered. C. During digestion cells in the stomach produce HCl to begin breaking down proteins, the HCl then stimulates the release of pepsin, to continue breaking down proteins. D. In the immune system, antibodies produced by B-cells bind to antigens, which activates other B-cells to produce antibodies of the same kind.
Identify the four components of a negative feedbackloop and explain what would happen if secretion of a bodychemical controlled by a negative feedback system becametoo great.
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.
;Make a Venn Diagram using the provided information below NEGATIVE FEEDBACK MECHANISM • Most control mechanisms in the human body are negativefeedback mechanisms• A negative feedback mechanism DECREASES theintensity of the stimulus and eliminates it• When a variable is above or below set point, integratortriggers a move in the OPPOSITE DIRECTION to reachthe set valueEx. Body temperature, blood pressure, pH and CO2 levels,blood glucose levelsPOSITIVE FEEDBACK MECHANISM• A positive feedback mechanism ENHANCES the originalstimulus to ACCELERATE activity• Integrator triggers a move in the SAME DIRECTIONtriggering an “explosive” response• Positive feedback mechanisms are less commonEx. Blood clotting, childbirth (oxytocin)
A fever is an increase in body temperature above normal range. A fever causes metabolic changes that push the person's body temperature even higher. If body temperature rises above 45oc death occur because cellular proteins change shape and metabolism stops. Is a fever of positive or negative feedback system? Explain
Match the body temperature control item to the appropriate location in the negative feedback loop. Effector when variable is low Effector when variable is high Control center Sensor Controlled variable A. Muscles for shivering and goosebumps B. Nerves in skin C. Brain D. Sweat glands E. Temperature
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.
Which of the following is an example of a negative feedback loop? a) shivering in response to a cold b)platelets responding to a cut c) childbirth d) lactation
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.…
If the oxygen level in the blood decreases, the brain sends a message to the lungs/diaphragm to breathe faster, which increases the levels of oxygen in the blood. This describes a negative or positive feedback loop.