life science chapt4

Life Science Cells & Energy

Spring 06’

Amazing Energy

• How do animals get the energy to do the things they do?

• Hummingbirds flap their wings 90 beats per SECOND!

• Certain types of falcons can fly at speeds of 200 mph

• These animals get their energy from the foods they eat-their cells breakdown the food and turn it into energy

Energy

• Energy can be found in many different forms. • The sun gives off light energy• Food breaks down into chemical energy• Sugar is called glucose and glucose molecules

are absorbed by the cells of your body for energy

• Cells turn the glucose into a special compound called ATP

• ATP is the actual energy form easily broken down by the cells for energy.

How materials enter and leave the cell

• Cells need to absorb certain materials to carry out life functions. They also need to dispose of waste materials that are a byproduct of life functions.

• The cell is semipermeable. There are tiny holes in the cell membrane that allow certain molecules to pass through

• Food must be broken down into the nutrients the body needs and those nutrients are small enough and have the coding to allow them to pass through