Download Energy from Respiration

ENERGY FROM
R E S P I R AT I O N
AEROBIC
R E S P I R AT I O N
WHO NEEDS MORE ENERGY PER DAY?
WHO NEEDS MORE ENERGY PER DAY?
~ 11 510 KJ
~ 8830 KJ
LEARNING OBJECTIVES
• Be able to describe aerobic respiration
• Know where it takes place.
RESPIRATION
- A SERIES OF REACTIONS WHERE
ENERGY IS RELEASED FROM….
GLUCOSE!
AEROBIC RESPIRATION
• Needed by many organisms for energy.
• What’s unique about aerobic respiration?
AEROBIC RESPIRATION
• Aerobic respiration requires oxygen.
• Glucose reacts with oxygen to release energy for
your cells.
• What are the waste products of this reaction?
AEROBIC RESPIRATION
• The waste products of aerobic respiration:
AEROBIC RESPIRATION
• Glucose + Oxygen  carbon dioxide + water (+ energy)
SHOWING AEROBIC RESPIRATION
• We can deprive things of what they need.
• OR we can show that the products have been
produced.
SHOWING AEROBIC RESPIRATION
• We can deprive things of what they need.
• OR we can show that the products have been
produced.
LIMEWATER AND CARBON DIOXIDE
• Lime water reacts with carbon
dioxide. The greater the
concentration of carbon dioxide,
the more milky lime water gets.
THE SITE OF RESPIRATION
• Respiration occurs in mitochondria
and is controlled by enzymes.
• The folded inner membrane
provides a large surface area for
the everything to happen
THE SITE OF RESPIRATION
• The more mitochondria, the more active the cell
WHY RESPIRE?
WHY RESPIRE?
• Living cells need energy!
• A lot of this energy goes towards building up
molecules.
WHY RESPIRE?
• In animals: some of this
energy is used in muscle
contractions.
WHY RESPIRE?
• This energy is also used to control
our body temperature.
THE EFFECT
OF EXERCISE
ON THE BODY
WHAT CHANGES HAPPEN WHEN YOU
GO FOR A RUN?
LEARNING OBJECTIVES
• Describe how glycogen is used in the body.
• Describe how the body responds to the demands of
exercise.
MUSCLES
• Protein fibers that occur in groups
• Muscles need energy from respiration in order to
contract. They contain a lot of mitochondria.
GLYCOGEN
• Muscles store glucose as
glycogen.
• This can be easily
converted back to glucose
for use during exercise.
WHEN WE EXERCISE THERE IS A
HIGHER DEMAND FOR RESPIRATION.
BODILY CHANGES THAT TAKE PLACE
DURING EXERCISE.
• Heart rate Increases
• Rate and depth of breathing increases
• The arteries supplying muscles dilate.
WHAT'S THE POINT OF THIS?
• All of these changes occur to meet bodily demands for
respiration.
• I.e., So that more oxygen and glucose is supplied and
more carbon dioxide is removed.
BENEFITS OF EXERCISE
BENEFITS OF EXERCISE
BENEFITS OF EXERCISE
• Heart and lungs become larger.
• Provides a bigger and more efficient blood
supply.
MEASURING UP
• To tell how fit one is examine:
• Resting breathing and heart rates (low - ).
• How much these rates increase with exercise (less - ).
• How quickly these rates return to normal (faster - ).
PRACTICAL
RECALL
• We completed a variety of exercises and examined
their effects on heart rate.
ANAEROBIC
R E S P I R AT I O N
VICTORY
O
LORD!
WHY CAN’T WE DO THIS FOREVER?
LEARNING OBJECTIVE
•Explain why
anaerobically
exercise.
muscles respire
during
vigorous
RECALL: WHAT DO WE NEED FOR
AEROBIC RESPIRATION?
ANAEROBIC RESPIRATION
• With vigorous activity muscles may
use up oxygen faster than it is
supplied.
• If this happens, we can still get energy
from glucose. We may do this via
anaerobic respiration.
ANAEROBIC RESPIRATION
• In anaerobic respiration, glucose is not
completely broken down and lactic acid is
produced.
WE HAVE
Glucose  lactic acid (+ a little energy)
IF YOU ARE FIT
You can supply more oxygen more efficiently
when exercising.You will not run short of
oxygen quickly.
MUSCLE FATIGUE
• Long periods of vigorous activity
causes muscles to fatigue.
– Less efficient contractions.
• The build-up of lactic acid is one
cause of this.
• Flowing blood removes lactic acid.
HW – CARRY OUT A MINI EXPERIMENT.
• I will carry out a single repetitive action until I tire.
– My action will be:
• After a period of rest, I will do the actions again (and again…)
and fill out the following table.
• Then I will develop a conclusion.