Go Back   Freethought Forum > The Library > Articles & Essays > Science

Article Tools Display Modes
Intro to Anatomy 5: Cellular (Aerobic) Respiration
Intro to Anatomy 5: Cellular (Aerobic) Respiration
The Lone Ranger
Published by The Lone Ranger
Default Introduction

An Introduction to Human Anatomy and Physiology
Chapter Five: Cellular (Aerobic) Respiration

As you no-doubt recall, some organisms, known as autotrophs, can manufacture their own food. Most do this by using the molecule chlorophyll to absorb solar energy, which is then used to manufacture glucose from carbon dioxide and water. This is photosynthesis; almost all plants and algae, and many bacteria are capable of manufacturing food in this way.

Other organisms are heterotrophs, because they cannot manufacture their own food. Instead, they must eat other organisms.

As you also know, organisms need food for two reasons. Food provides the raw materials organisms need in order to build body tissues, and it provides the energy organisms need for growth, maintenance, and repair of body tissues. Mostly, this energy is provided by the chemical breakdown of carbohydrate molecules; as molecular bonds are broken, the energy they store is released, and ATP molecules are used to transport the energy to wherever it’s needed.

The process in which organisms break down high-energy molecules (glucose, in particular) to produce energy that is stored and transported by ATP molecules takes place inside cells and is known as cellular respiration. Because the complete breakdown of glucose into CO2 and H2O requires oxygen to proceed, cellular respiration is often referred to as aerobic respiration – though strictly speaking, aerobic respiration is the second half of cellular respiration.

Respiration, by the way, is one of those confusing words that’s used in several different ways. Most people think of “respiration” as the moving of air in and out of the lungs, but strictly speaking, that’s “breathing” – or more properly, ventilation. “Respiration” is the metabolic breakdown of organic molecules for energy. If oxygen is used in the breakdown process (as it usually is), then it’s aerobic respiration; otherwise, it’s anaerobic respiration.


Article Tools

Featured Articles
<< <    Next Page: Cellular Respiration: A Brief Overview (Page 1 of 5)    >  >>

  Freethought Forum > The Library > Articles & Essays > Science

Currently Active Users Viewing This Article: 1 (0 members and 1 guests)
Article Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 03:21 AM.

Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.

Article powered by GARS 2.1.8m ©2005-2006
Page generated in 0.30030 seconds with 17 queries