Class notes
Human biology lecture notes
- Course
- Human Biology (HUB228)
- Institution
- University Of The Western Cape (UWC)
Human biology lecture notes about the introduction to metabolism.
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Lecture 15Introduction to
metabolism
B Curr II HUB228 2022
Dept. Medical Biosciences
University of the Western Cape
, Introduction
• please revise HUB118 lecture 28 & 36
• energy = capacity to do work
• work = transfer of energy
• First Law of Energy = energy can’t be created or destroyed, it can
only be transformed from one form to another
• the total amount of energy in the universe is therefore always
constant
• the sun is the supplier of energy to all living things
• photosynthesizing organisms (plants and algae) are able to capture
2% of the solar energy that reaches the earth
• these organisms use solar energy to make their own organic food
(solar energy → chemical energy)
• in turn, these organisms become food for all other living things
(directly and indirectly)
• as transformations occur, useful energy is lost to the environment in
the form of heat
, Introduction
From: Mader, S.S. (1996).
Biology, 5th Ed.
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