1 / 14

Notes 4-2

Notes 4-2. Respiration. Food = Energy?. Not exactly! It’s a complicated process… Eat food  food broken down into small molecules by digestive system  molecules move through bloodstream to body cells  energy from molecules released. Respiration.

terrel
Download Presentation

Notes 4-2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Notes 4-2 Respiration

  2. Food = Energy? • Not exactly! • It’s a complicated process… • Eat food  food broken down into small molecules by digestive system  molecules move through bloodstream to body cells  energy from molecules released

  3. Respiration • Cells break down food (sugars) and release their energy • The cells of ALL living things respire (yes, plants do too!) • As food is converted into energy, your cells store the energy until your body needs it • Think of this like a bank account; a bank stores your money until you need it, then you take it out.

  4. Respiration has 2 stages:

  5. Stage 1: • Takes place in the cytoplasm of cells • Glucose (sugars from the food you eat) is broken down into smaller molecules • A small amount of energy is release • No oxygen is involved in step 1

  6. Stage 2: • Takes place in the mitochondria • Smaller molecules combine with oxygen • A chemical reaction occur that releases a lot of energy, along with water and carbon dioxide (this is why the mitochondria is the “powerhouse”)

  7. Two Stages of Respiration • During respiration, cells break down simple food molecules such as sugar and release the energy they contain.

  8. Respiration Equation • The equation states that sugar (glucose) combined with oxygen yields water, carbon dioxide, and energy

  9. Where does it come from? • Where does the sugar come from? • The food we eat! • Where does the oxygen come from? • Plants release it as a waste product during photosynthesis and we breathe it in!

  10. What do we do with it? • What happens to the carbon dioxide we make? • We release it as a waste product when we exhale, and plants then take it in to photosynthesize. • What happens to the water we make? • Some of it is used for normal cellular functions and some of it is release when we exhale.

  11. Photosynthesis and Respiration • You can think of photosynthesis and respiration as opposite processes.

  12. Fermentation • Some cells can obtain energy without the oxygen through fermentation • Yields much less energy than respiration! • Examples: some single celled organisms that live deep in the ocean where there is no oxygen

  13. Alcoholic fermentation • Yields alcohol, carbon dioxide and a small amount of energy • Example: carbon dioxide made by yeast during baking makes air bubbles in bread causing it to rise • Example: bubbles in beer and sparkling wine caused by carbon dioxide

  14. Lactic Acid fermentation • Yields a product known as lactic acid • When you exercise, your cells eventually run out of oxygen, yet they still need to provide your body with energy…. They do this by fermentation. • The lactic acid your cells make leave your muscles feeling weak or sore. • How many of you have experienced this?

More Related