b9 Flashcards
respiration
What do organisms need energy for?
*chemical reactions to build larger molecules
*muscle contraction for movement
*keeping warm
What is the difference between aerobic and anaerobic respiration?
aerobic respiration uses oxygen, anaerobic respiration does not
Write the word equation for aerobic respiration.
glucose + oxygen ➞ carbon dioxide + water
Write the word equation for anaerobic respiration in muscles.
glucose ➞lactic acid
Why does aerobic respiration release more energy per glucose molecule than anaerobic respiration?
oxidation of glucose is complete in aerobic respiration and incomplete in anaerobic respiration
What is anaerobic respiration in yeast cells called?
fermentation
Write the word equation for anaerobic respiration in plant and yeast cells.
glucose→ethanol+carbon dioxide
How does the body supply the muscles with more oxygenated blood during exercise?
heart rate, breathing rate, and breath volume increase
What substance builds up in the muscles during anaerobic respiration?
lactic acid
What happens to muscles during long periods of activity?
muscles become fatigued and stop contracting efficiently
What is oxygen debt?
amount of oxygen the body needs after exercise to react with the accumulated lactic acid and remove it from cells
What is metabolism?
sum of all the reactions in a cell or the body
