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