6.1 The Structure and Function of the Cell Membrane The cell membrane has many functions. –protection –obtaining food –ridding wastes –communication –interaction with other cells A soap bubble is like a cell membrane.

6.1 The Structure and Function of the Cell Membrane The cell membrane is made of several types of molecules.

6.1 Why are cells so small? To understand why the volume of a cell increases faster than its surface area, let’s imagine a perfectly square cell.

6.1 Why are cells so small? Which cell type has a higher volume to surface area ratio?

6.2 Cells and Energy Photosynthesis is a chemical reaction that takes place in the chloroplasts of plant cells. During photosynthesis, plants use the energy of sunlight to produce energy-rich molecules called carbohydrates (ex. glucose). In photosynthesis, plants take in carbon dioxide and water and release glucose and oxygen wastes.

6.2 Cells and Energy Chloroplasts are where photosynthesis occurs. Chloroplasts work much like solar cells found in calculators.

6.2 Cellular respiration Cellular respiration is a chemical reaction that occurs in all living things. Cells use oxygen and glucose to produce carbon dioxide, water, and energy.

6.2 Cellular respiration In most eukaryotic organisms, cellular respiration takes place in the mitochondria of cells. During cellular respiration, energy is stored in a molecule called ATP while some energy is released as heat.

6.2 Comparing photosynthesis and respiration The chemical equations of photosynthesis and respiration have an interesting relationship. The reactants in photosynthesis are the products in cellular respiration! The reactants in cellular respiration are the products in photosynthesis!

Review How are photosynthesis and cellular respiration related? The wastes in photosynthesis are used to create energy in cellular respiration and the wastes in cellular respiration are used to create energy in photosynthesis.