Unit 3: Homeostasis & Body Systems

Homeostasis:

• allows for a wildly fluctuating internal environment

• is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation

• is the maintenance of a relatively stable external environment and does not incorporate a form of feedback regulation

• when you stay at home

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If the environment gets cold, we will often shiver in order to:

• keep body temperature the same as the external temperature

• decrease body temperature

• increase body temperature

• regulate blood pressure

An example of a negative feedback loop is ...

• Blood glucose regulation

• Temperature regulation

• Heart rate regulation

• All of the above

Maintaining body temperature is an example of a:

• negative feedback loop

• positive feedback loop

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What are the levels of organization starting from simple to complex?

• cells- tissues- organs- organ systems- organisms

• cells- organs- organisms- tissues- organ systems

• organisms- organ systems- organs- tissues- cells

• tissue- cells- organs- organ systems- organisms

When glucose levels in the blood rise, your brain sends a signal to your pancreas. The pancreas releases insulin, which opens channels in cell membranes to allow glucose to enter the cell, lowering blood sugar levels. This is an example of a:

• Negative Feedback Loop

• Positive Feedback Loop

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The tendency of an organism to maintain a balanced state in order to stay healthy.

• Stimuli
• Response
• Tropism
• Homestasis

What is the point of a feedback loop?

• To provide the body with more energy

• To provide the body with more food

• To make sure the conditions in the body are always changing

• To make sure the conditions in the body remain stable

The process of childbirth is an example of:

• negative feedback loop
• positive feedback loop

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What type of feedback loop is shown?

• negative

• neutral

• positive

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