AP Biology Feedback Mechanisms

These two body systems regulate feedback mechanisms.

• Skeletal & Muscular

• Skeletal & Endocrine

• Muscular & Nervous

• Endocrine & Nervous

Answer explanation

The Endocrine and Nervous systems are responsible for regulating feedback mechanisms in the body. The Endocrine system uses hormones to regulate long-term changes in the body such as growth and development, while the Nervous system controls immediate responses to stimuli by sending signals to different parts of the body. Neither the Skeletal, Muscular nor the combination of these systems perform this function.

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NGSS.HS-LS1-3

Which of these does homeostasis most directly relate to? Choose the correct answer.

• Stability

• Evolution

• Scale and structure

• Interacting systems

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NGSS.HS-LS1-3

As carbon dioxide levels in the atmosphere rise, the temperature of the Earth rises. As the Earth warms the rate of photosynthesis in plants increases, more carbon dioxide is therefore removed from the atmosphere by plants, reducing the greenhouse effect and reducing global temperatures.

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• Negative Feedback

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NGSS.HS-ESS2-2

NGSS.HS-LS2-5

As the Earth warms, ice cover melts, exposing soil or water. Albedo decreases (albedo is the fraction of light that is reflected by a body or surface). More energy is absorbed by the Earth’s surface. Global temperature rises. More ice melts.

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• Negative Feedback

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NGSS.HS-ESS2-2

As the Earth warms, upper layers of permafrost melt, producing waterlogged soil above frozen ground. Methane gas is released into the environment. The greenhouse effect is enhanced. The Earth warms, melting more permafrost.

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• Negative Feedback

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NGSS.HS-ESS2-2

As the Earth warms, evaporation increases. Snowfall at high latitudes increases, icecaps enlarge. More energy is reflected by increased albedo of ice cover. The Earth cools. Rates of evaporation fall.

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• Negative Feedback

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NGSS.HS-ESS2-2

NGSS.HS-ESS3-5

Your body temperature rises as you walk around outside in Bangladesh on a hot afternoon. The sensors in your skin detect the rise in your surface temperature so you start to sweat.

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• Negative Feedback

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NGSS.HS-LS1-3

A thermostat in a central heating system can determine the temperature of your living room. It switches the air conditioner on when the temperature increases to a predetermined level and shuts it off when it cools to another level. The room temperature remains within a comfortable level regardless of the temperature outside

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• Negative Feedback

Tags

NGSS.HS-LS1-3

Some organisms have internal feedback systems. Physiological changes occur to prevent breeding when population densities are high and promote breeding when population densities are low.

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• Negative Feedback

Tags

NGSS.HS-LS1-3

You are lost on a snowy mountain. When your body senses that it is cooling below 37°C, various mechanisms such as shivering help to raise your body core temperature again. However if these are insufficient to restore normal body temperature, our metabolic processes start to slow down, because the enzymes that control them do not work so well at lower temperatures. As a result, you become lethargic and sleepy and move around less and less, allowing your body to cool even further. Unless you are rescued at this point, your body will reach a new equilibrium; you will die of hypothermia.

• Positive Feedback

• Negative Feedback

Tags

NGSS.HS-LS1-3