7.1 Respiratory Process in Energy Production

8/13/2019 7.1 Respiratory Process in Energy Production

1/13

7.1 The Respiratory

Process in EnergyProduction

Chapter 7: Respiration


2/13

What is respiration

Respiration refer to the process ofobtaining oxygen and delivery it to the cell

for cellular respiration and removingcarbon dioxide produced by the cells.

Respiration is an important living processthat occurs in two main stages :

external respiration (physiology) andinternal respiration (biochemistry)


3/13

External respiration orbreathingis amechanical process that maintain acontinuous exchange of gases betweenthe respiratory surfaces and of andorganism and its environment.

Internal respirationor cellular respiration

is the biochemical process in which energyis made available to all living cells.


4/13

Energy requirement in living

processAll living processes that take place in the

body need energy.

Energy is required for

excretion of waste product

muscle contraction which enables

locomotion

absorption of digested food through

active transport


5/13

active transport of biochemicalsubstances

transmission of nerves impulses

cell division (produced new cell)maintain the body C (warm-blooded)

synthesis of lipid, hormones, proteins

and enzymes


6/13


7/13

Energy production in Aerobic

Respiration Aerobic means respiration in the

presence O2

Aerobic respiration(cellular respiration)requires a continuous supply of oxygenwhich is obtained from the air duringexternal respiration.

In the cell, glucose molecule are oxidisedby oxygen to released energy.


8/13

Aerobic respiration involves the oxidation

of glucose in the presence of O2to CO2,H2O and energy.

Organisms that respire aerobically are

called aerobic organisms.Aerobic respiration releases all the

available energy stored within the glucosemolecules.

Most of energy released is used tosynthesis adenosine triphosphate (ATP)from adenosine diphosphate (ADP).


9/13

ATP acts as an instant source of energy

and the main energy supply to all living

cell which drives cellular processes as and

when needed

ATP consist phosphate bondwhich can

easily broken down to release energy


10/13

Anaerobic respiration

Anaerobic respiration means respirationwhere there is very little O2or no more O2.

Organisms anaerobs. Occurs in the cytoplasm.

During vigorous physical activities such as

running in a race and brushing a cloth. Rate of respiration and rate of heartbeat

increase to deliver more oxygen to musclecell.


11/13

Blood cannot supply oxygen fast enough

to meet the demand for ATP oxygendebt.

Under this condition, the muscle obtain

extra energy from anaerobic respiration. The glucose molecules break down

partially to produce lactic acidand energy

(less due to incomplete break down of

glucose)

Glucose lactic acid + 2 ATP mole


12/13

The concentration of lactic acid may reach a

level high enough to cause muscular cramps

and fatigue.

The body need rest and recover (to get more

oxygen)

The excess oxygen is used to oxidise the lacticacid to carbon dioxide and water, which are the

excreted.

Therefore, oxygen debt is the amount of oxygen

needed to remove the lactic acid from the

muscle cell

Oxidation of lactic acid occurs mainly in liver.


13/13

Summary:

Respiration:

is the release of energy from food,takes place in animal and plant cells.

Aerobic Respiration requires:

Glucose,

Oxygen.

Anaerobic Respiration requires:Glucose.

Aerobic Respiration produces:

Energy,

Carbon Dioxide,

Water.

Anaerobic Respiration produces:

Energy (not as much),

Carbon Dioxide,

Lactic Acid or Alcohol.

7.1 Respiratory Process in Energy Production

Documents

Transcript of 7.1 Respiratory Process in Energy Production