4.2 Respiration

7.1.d Students know that mitochondria liberate energy for the work that cells do and that chloroplasts capture sunlight energy for photosynthesis.

What is Respiration? Respiration- the process but which cells obtain

energy from glucose Key Concept: “During respiration, cells break

down simple food molecules such as sugar and release the energy they contain.

Cells of all living things carry out respiration because they need energy

Cells store energy like we store money in a bank- capture energy from sun and save during photosynthesis- when need energy the break down carbohydrates in respiration

Two Stages of Respiration During respiration, cells break down

simple food molecules such as sugar and release the energy they contain.

What is Respiration? 2 meanings for respiration- cellular respiration

and breathing Products of respiration-carbon dioxide and water We breathe out carbon dioxide Plants undergo Photosynthesis and make its own

food (sugar) Animal cells (and some others) get their glucose

from eating plants or animals that ate plants Respiration and Photosynthesis keep levels of

oxygen constant on Earth Respiration video

What is Respiration? Respiration equation:

Raw Materials Products

Video on Cellular respiration

Yields

Sugar

Oxygen Carbon Dioxide

Water

Photosynthesis and Respiration You can think of photosynthesis and

respiration as opposite processes.

The 2 Equations

+ energy

FermentationFermentation- energy

releasing process does not need oxygen

Key concept: “Fermentation provides energy for the cell without using oxygen.”

Amount of energy released is less than during respiration

Mitochondria

Fermentation- AlcoholicType of fermentation when

yeast and some other single celled organisms break down sugars

Called alcoholic because one of its products is alcohol

Other products are carbon dioxide and energy

Important to bakers- raises dough and creates bubbles in alcohol drinks

Fermentation- Lactic Acid Takes place at times in your

body When running muscle cells

use oxygen faster than it can replace it

Cells lack energy and fermentation occurs

Product is lactic acid When the lactic acid builds

up you feel pain (and weakness) in your muscles

What events occur during respiration?What is fermentation?

Section 2: Respiration