Scribd
Upload
20 views3 pages

Respiration

Cellular respiration is an exothermic process that occurs in living cells, releasing energy through aerobic (with oxygen) and anaerobic (without oxygen) means. Aerobic respiration fully breaks down glucose to produce energy, carbon dioxide, and water, while anaerobic respiration results in incomplete glucose breakdown, yielding less energy and different byproducts such as lactic acid in animals and ethanol in plants and yeast. Anaerobic respiration is crucial during intense exercise when oxygen is scarce and is also significant in fermentation processes for bread and beer production.

Uploaded by

evelenewong
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
20 views3 pages

Respiration

Cellular respiration is an exothermic process that occurs in living cells, releasing energy through aerobic (with oxygen) and anaerobic (without oxygen) means. Aerobic respiration fully breaks down glucose to produce energy, carbon dioxide, and water, while anaerobic respiration results in incomplete glucose breakdown, yielding less energy and different byproducts such as lactic acid in animals and ethanol in plants and yeast. Anaerobic respiration is crucial during intense exercise when oxygen is scarce and is also significant in fermentation processes for bread and beer production.

Uploaded by

evelenewong
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 3

Respiration

Cellular Respiration

 Cellular respiration is an exothermic reaction which is continuously occurring in living cells


 The chemical process of cellular respiration releases energy either in the presence of
oxygen (aerobic respiration), or in the absence of oxygen (anaerobic respiration).
 The energy transferred supplies all the energy needed for metabolic processes to occur
within cells and organisms as a whole.
 Organisms need energy for:
o Chemical reactions to build larger molecules from smaller molecules
o Muscle contraction to allow movement
o Keeping warm (to maintain a constant temperature suitable for enzyme activity)

Aerobic Respiration

 Aerobic respiration requires oxygen.


o It is defined as the chemical reaction in cells that uses oxygen to break down
nutrient molecules to release energy.
 Aerobic respiration is the complete breakdown of glucose to release a
relatively large amount of energy for use in cell processes and reactions.
 Carbon dioxide and water are produced as waste products as well as releasing useful
cellular energy

Anaerobic Respiration

 Anaerobic respiration does not require oxygen.


o It is defined as the chemical reaction in cells that breaks down nutrient
molecules to release energy without using oxygen.
 It involves the incomplete breakdown of glucose and so releases a relatively small amount
of energy for use in cell processes.
 Different breakdown products are formed depending on the type of organism that the
anaerobic respiration is taking place in animals and fungi

Anaerobic Respiration In Animals

 Anaerobic respiration mainly takes place in muscle cells during vigorous exercise
 When we exercise at high intensities, our muscles have a higher demand for energy
 Our bodies can only deliver so much oxygen to our muscle cells for aerobic
respiration
 When oxygen runs out, glucose is broken down without it, producing lactic
acid instead
 Glucose has not been fully broken down meaning there is still energy stored within the
bonds of lactic acid molecules
 Anaerobic respiration releases less energy than aerobic respiration

The balanced chemical equation for anaerobic respiration in animals


Anaerobic Respiration In Plants And Fungi

 Plants and yeast can respire without oxygen as well, breaking down glucose in the absence
of oxygen to produce ethanol and carbon dioxide
 Anaerobic respiration in yeast cells is called fermentation
 Fermentation is economically important in the manufacture of bread (where the carbon
dioxide produced helps the dough to rise) and in brewing (where the ethanol produced
makes beer)

Balanced equation for anaerobic respiration in plants and yeast

You might also like