Biology: Homeostasis

When you step out into the cold, your body shivers in order to keep its temperature at 98.6^oF.

• All living things use energy
• All living things contain cells
• All living things maintain homeostasis
• All living things grow and develop

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Green plants produce their own food through the process of photosynthesis.

• All living things use energy
• All living things contain cells
• All living things maintain homeostasis
• All living things grow and develop

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Which system regulates and control growth, development, and metabolism?

• Endocrine system

• Lymphatic system

• Integumentary system

• Skeletal system

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Which reaction would the body use to maintain homeostasis in cold temperatures?

• shivering

• sweating

• rumbling of the stomach

• restricting of blood vessels in the skin

Which factor affects osmosis through a membrane?

• how fast the carrier proteins move substances through the plasma membranes

• how slow the carrier proteins move substances through the plasma membranes

• concentration of water on one side of the membrane and the permeability of the membrane

• concentration of the water on both sides of the membrane and the permeability of the membrane

Osmosis is the diffusion of _____ across a selectively permeable membrane.

• food
• air
• water
• oxygen

During diffusion

• substances (things) moves from high to low concentration
• water moves when energy is used
• large or oddly shaped molecules move across a cell membrane
• water moves from high to low concentration

 In the given scenario what will happen?  An egg with a dissolved shell is placed in pure water for 48 hours.

• Water will move in and out of the cell equally, and the cell with neither shrink nor swell.
• The egg will gain water and swell.
• The egg will lose water and shrink.

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 An animal cell placed in a hypertonic (salty) solution will

• Stay the same
• Shrink- get smaller
• Swell- get bigger

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Ideally, your cells should be in a(n) _______ solution

• isotonic
• hypertonic
• hypotonic
• isometric

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