Homeostasis in Living Things

The maintenance of an organism’s internal environment is called:

• compensating
• homeostasis
• balancing
• routine

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

Homeostasis

• allows for a wildly fluctuating internal environment
• is impossible in vertebrates
• 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 often incorporates a form of feedback regulation

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Why is the sensation of thirst important to maintaining homeostasis?

• Water removed by the kidneys must be replaced

• Oxygen cannot diffuse into cells if a person is dehydrated

• Water molecules are needed to carry carbon dioxide waste to the kidneys

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Why does pulse rate increase during exercise?

• Oxygen and carbon dioxide must be removed from the body ASAP

• Gas exchange must happen more quickly than when a person is at rest

• Oxygen must be moved to the lungs and carbon dioxide must be moved to cells more quickly

• Carbon dioxide must be moved to the kidneys to be excreted

The group of organisms that use the process of homeostasis includes

• mammals, only

• animals, only

• plants and animals

• all living things

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

• Stimuli
• Response
• Tropism
• Homestasis

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If a person's blood cells shrivel (shrink) their blood is likely

• isotonic

• hypotonic

• hypertonic

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Which of the following is most likely to cause a person's blood cells to burst?

• eating many salty foods

• eating many greasy foods

• drinking small amounts of water

• drinking very large amounts of water

Which of the following is NOT an example of homeostasis?

• A human producing gametes

• A plant bending toward sunlight

• A bird drinking water when thirsty

• A dog stealing chicken off the kitchen counter when hungry