HOW CELLS WORK FROM THE ATOMIC LEVEL TO THE WHOLE BODY
IT ALL STARTS WITH ATOMS WHICH ARE MADE UP OF MATTER
The four most common atoms in the human body are:
There are about 7,000,000,000,000,000,000,000,000,000 atoms in our body!
THE ATOMS BOND AND CREATE MOLECULES
When they bond, electrons are shared between two atoms. When two oxygen atoms bond together to form an oxygen molecule, they share four electrons – two from each oxygen atom.
Two examples of bonding are water (H2O), and carbon dioxide (CO2)
THOSE MOLECULES BOND AND FORM ORGANELLES
Organelles are a “group” of organized / specialized structures within a living cell that operate like organs by carrying out their specified tasks.
An example of some key organelles are the nucleus, cell wall, centriole, chloroplast, vacuoles, ribosomes and peroxisomes.
Organelles (aka cell parts) form cells such as leukocytes (white blood cells), erythrocytes (red blood cells), neurons (nerve cells), and adipocytes (fat cells)
Cells are considered to be the smallest living units in the body
WHEN SIMILAR TYPES OF CELLS GET TOGETHER, THEY FORM TISSUES
There are many tissues but the main 4 types are:
Epithelial Tissue: Covers the body and most organs
Connective Tissue: Most abundant and separates the cells in a matrix
Muscle Tissue: Specialized tissue that contracts and relaxes
Nervous Tissue: Located in the brain, spinal cord and peripheral nerves
When 2 or more tissues combine they form organs that work together to do a job.
For example: Our skin is made of hair tissue, oil and sweat gland tissues, nerve tissue, blood tissue, and many other tissues to make the organ called skin
Organs arrange to form organ systems
The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
Organ systems combine to form an organism (whole body level)
The survival of the organism depends on the integrated activity of all the organ systems, often coordinated by the endocrine and nervous systems
Audio Attributes & Credit: “In Your Arms” Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License