Post on 19-Jan-2016
CELLULAR RESPIRATIONMaking ATP
The Purpose
•Convert the energy in organic molecules into a usable form (ATP)
•ATP can then be used for work
Who Goes Through Respiration?• All living organisms go through some sort of cellular respiration (though many do not use the complete process) to make ATP
• Plants still go through cellular respiration!
The Two Types
Aerobic Respiration
• Requires oxygen• Fully breaks down glucose to CO2 and makes LOTS of ATP
• Requires mitochondria
Anaerobic Respiration
• No oxygen needed• Glucose only partially degraded
• Makes small amounts of ATP more quickly
• No mitochondrial involvement
Aerobic Respiration• Fuel + Oxygen + ADP + P Carbon Dioxide + Water + ATP• 3 stages, 2 of which take place in the mitochondria
Anaerobic Respiration• Doesn’t fully break down the sugar
• So instead another product must be made via fermentation
• For example our muscles, when deprived of oxygen, generate lactic acid
Some organisms do both• Some organisms, such as humans, go through both aerobic and anaerobic respiration depending on the conditions
• Some organisms such as bacteria cannot go through aerobic respiration
What About the Maximum Effort?• We have a very small supply of Creatine Phosphate that
can be used to quickly generate ATP• i.e. during weightlifting
• We run out of this store in about 2-10 seconds of intense exercise
• BUT we can regenerate some during periods of rest
Random Facts
• Every cell contains on average about a billion ATP
molecules• We have at any time about 1 sextillion
(100,000,000,000,000,000,000,000) ATP molecules in our
body• We use all of them in minutes and must regenerate them• The average ATP molecule is made and degraded 3
times per minute• We go through about 20 pounds worth of ATP every hour
http://www2.kprdsb.ca/cdciw/departments/Physical_ed/EXSCI%20LESSONS/UNIT2-ANATOMY/ANATOMY%20-%20ATP%20Energy%20System.pdf