Notes #3: Homeostasis and Cell Transport

What is mean by homeostasis?

• Controls and coordinates body activities through chemical 
• controls and coordinates body activities through electrical impulses
• For maintenance of a steady state in the internal environment
• remove metabolic waste products from the cel

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____________________ helps warm the human body when we are cold.

• sweating

• shivering

• inhaling oxygen

• exhaling carbon dioxide

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Which of the following is not regulated by homeostasis?

• body temperature

• blood sugar

• blood pH

• body movements

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Homeostasis in the human body is often maintained by a: 

• neutral feedback loop 
• solar feedback loop
• positive feedback loop
• negative feedback loop

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Positive feedback is when the change caused by the stimulus is

• decreased
• non existant
• increased
• changes constantly

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When you get cut, your skin cells release hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop bleeding. The hormone signals continue until the cut is closed.

• Positive Feedback Response
• Negative Feedback Loop 

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When you are cold, you shiver and your blood vessels contract, which warms you up. When you are hot, you sweat and your blood vessels expand, which cools you down.  

• Positive Feedback Response
• Negative Feedback Loop 

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Water diffusing with the concentration gradient from high water concentration to low water concentration across a cell membrane is....

• Facilitated Diffusion
• Simple Diffusion
• Active Transport
• Osmosis

What is an example of a positive feedback mechanism?

• 
• 

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Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

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