Positive and Negative Feedback Loops

Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

Tags

NGSS.HS-LS1-3

A _________________ feedback loop moves a system to an extreme.

• Positive

• Neutral

• Circular

• Negative

Tags

NGSS.HS-LS1-3

A ________________ feedback loop makes a system more stable.

• Positive

• Neutral

• Negative

• Circular

Tags

NGSS.HS-LS1-3

When the population of deer in an area begin to grow, they start overgrazing the vegetation that feeds them. When there is not enough vegetation to sustain the rapidly growing deer population, they will begin to die off until the vegetation grows back to normal levels and the deer will have enough food to repopulate again. 

• Positive

• Negative

Tags

NGSS.HS-LS2-1

NGSS.HS-LS2-6

NGSS.HS-LS4-5

. Imagine you are out walking in the country. As you walk, the sun rises higher in the sky and the air temperature increases. Your body senses that your internal temperature is rising and you start to sweat, which reduces your body temperature by evaporating water from your skin, returning your temperature to normal

• Positive Feedback Loop

• Negative Feedback Loop

Tags

NGSS.HS-LS1-3

Imagine you are lost on a snowy mountain. When your body senses that it is cooling, various mechanisms such as shivering help to raise your internal temperature. If these are insufficient to restore normal body temperature, your body processes start to slow down. 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, you will die of hypothermia.

• Positive Feedback Loop

• Negative Feedback Loop

Tags

NGSS.HS-LS1-3

As carbon dioxide levels in the atmosphere rise, temperature of Earth rises. As 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.

• Positive Feedback Loop

• Negative Feedback Loop

Tags

NGSS.HS-ESS2-2

NGSS.HS-LS2-5

As Earth warms, ice cover melts, exposing soil or water. More energy is absorbed by Earth’s surface (soil is darker than ice.) Global temperature rises, more ice melts.

• Positive Feedback Loop

• Negative Feedback Loop

Tags

NGSS.HS-ESS2-2

Arctic foxes feed on Arctic Hair. If the number of hare increases, there is more food available for the foxes and they are able to raise more offspring. This, in turn will cause the number of foxes to rise. The foxes will hunt more hare. As hare numbers drop, fox numbers will start to drop as well

• Positive Feedback Loop

• Negative Feedback Loop

Tags

NGSS.HS-LS1-3

NGSS.HS-LS2-1

When a microphone picks up sound from a speaker, it amplifies the sound, which is then picked up again by the microphone, causing a loud screeching noise.

• Negative Feedback Loop

• Positive Feedback Loop