Locomotion is the ability to move through one's environment.
What are the advantages of being motile?
There are different mechanisms by which organisms move. Single celled creatures move by:
Bigger organisms need something stiff (bones) and muscles to allow for movement. Some organisms have their bones on the inside, some on the outside:
What are the advantages of each?
These bones do more than just allow for movement.
What do bones do for us?
[make RBCs, WBCs, Platelets; protection; structure; store fat and minerals; allows movement; etc.]
Bones more complex:
Muscles more complex:
Other connective tissue includes:
How do muscles contract?