Homeostasis powerpoint

HOMEOSTASIS ANDDIFFUSION

CELLS AND THEIR ENVIRONMENT

LIFE’S BALANCING ACT

If you are too hot or too cold your body

temperature is out of balance

When we are too cold we

shiver, it warms us up

When we are too hot we

sweat, it cools us down.

Sweating and shivering are

the body’s response to

extreme temperature.

They help the body return to a

temperature that is comfortable. The body is balanced

CELL BALANCEYour body is made up of cells. And, just like your body, cells must stay balanced. They must have just the right amount of materials to maintain the proper environment for your body.

HOMEOSTASIS

The balance that all living things have to maintain, is called

HOMEOSTASIS.

INTRODUCING DIFFUSION

The things we eat and drink are made of small particles called molecules.

These particles are always moving around and bumping into each other.

They will move from areas that are crowded to areas that are less crowded until they spread out evenly.

The movement of particles in our cells, from areas that are crowded to areas that are less crowded, is called

DIFFUSION

crowded less crowded

Remember the cell? How many of these parts do you remember?

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nucleus

mitochondria

Cell membrane

cytoplasm

Diffusion happens in cells.

This is a cell membrane. Can you find the parts where particles might go in and out of the cell? Click to check your answer.

This is one of five channels in the diagram that move particles in and out

Think of the cell membrane like the doors of a school. Students go in and out only through the doors.

Students are like the particles in cell diffusion. They move from the crowded buses into the school through the doors. Once inside they spread out pretty evenly into their classrooms.