Respirationand

PhotosynthesisOCS Biology

We’ll start this presentation with a review of photosynthesis and

chloroplasts. Then, we will go on to review respiration.

Photosynthesis and respiration are closely related: photosynthesis

produces energy, and respiration uses energy.

Energy Producer of Cells: Chloroplasts

Remember learning about the chloroplasts? They are green. Plants have chloroplasts. Photosynthesis occurs in the chloroplasts.

Equation for Photosynthesis

Carbon dioxide + water sugars + oxygenSunlight and chlorophyll are needed, too.

Importance of Respiration

Respiration is a very important process for living things. It is how the energy we need for our daily lives is released from

the food we eat. Red blood cells take the oxygen we breathe from our lungs to our cells, and the mitochondria use

the oxygen to “burn” our digested food for energy.

Two Types of Respiration

Aerobic respiration is respiration that requires oxygen.

Anaerobic respiration is respiration that does not require

oxygen.

Equation for Aerobic Respiration

This is the equation for aerobic respiration. The reactants are on the left of the arrow. The

products are on the right of the arrow. Does it remind you of photosynthesis in any way?

Powerhouses of Cells: Mitochondria

Remember learning about the mitochondria? We called them the powerhouses of cells. Aerobic

respiration occurs in the mitochondria.

What about anaerobic respiration?

There are two types of anaerobic respiration. They are both called fermentation:

Lactic acid fermentation and

Alcohol fermentation

Lactic Acid Fermentation

When our muscles get tired from exercising, lactic acid forms during anaerobic

respiration. Sometimes our muscles get sore.

Alcohol Fermentation

Rising bread is an example of anaerobic alcohol fermentation.

Foods Made By Fermentation

Anaerobic respiration called fermentation makes all of these foods possible.

Let’s Review: Here’sComparison of

Aerobic and Anaerobic Respiration

That’s Enoughabout respiration!

Now, breathe! Your respiration is aerobic . . .

The End