Homeostasis and Cellular Processes

___ is the maintenance of an internal balance of conditions in a changing external environment.

• Diffusion

• Endocytosis

• Passive transport

• Homeostasis

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What are four things that cells can do to maintain homeostasis?

• make new cells

• exchange materials

• rest

• eliminate wastes

• obtain and use energy

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Molecules move in and out of a cell by diffusion. The picture shows a cell and molecules both inside and outside the cell. How will the molecules in this illustration move as a result of diffusion?

• into the cell

• out of the cell

• into another cell

• to the external environment

Organisms can respond to changes in their environment in order to maintain a balance, called homeostasis. What does a tree do to maintain homeostasis during the winter months?

• shivers

• hibernates

• absorbs sun

• loses leaves

Cells must be able to perform certain functions in order to survive. Which of the following must all cells do to survive?

• obtain energy

• absorb wastes

• utilize oxygen

• continue growing

Even when it is cold outside, the human body maintains an internal temperature of 37 degrees Celsius. Which term describes the maintenance of a stable internal condition?

• endocytosis

• homeostasis

• mitosis

• photosynthesis

The survival of a cell depends on the cell maintaining homeostasis. What is most likely to happen to a cell if homeostasis is not maintained?

• The cell will immediately divide.

• Cell processes will continue unchanged.

• The cell will eliminate wastes more efficiently.

• Many chemical reactions in the cell will slow down or even stop

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How can hibernation help an organism maintain homeostasis?

• The animal consumes more food during the winter in order to survive.

• All body processes slow down in order to help the animal survive through cold temperatures.

• Most body processes stop completely during cold weather, then start again during warm weather.

• Most body processes speed up in order to help the animal generate heat through the cold winter.

Cell membranes are semi-permeable because they allow only certain particles to cross into or out of the cell.

• True

• False

Tags

NGSS.MS-LS1-2

The movement of particles across a cell membrane without the use of energy by the cell is called?

• Active Transport

• Passive Transport

• Endocytosis

• Exocytosis