Browse Lessons
Assign Lesson

Help Teaching subscribers can assign lessons to their students to review online!

Assign Lesson to Students

Share/Like This Page

The Skeletal System

The Skeletal System

Introduction: The skeletal system in the body system that provides support and protection for the internal organs. It is also responsible for producing red blood cells and serves as a depository for calcium. Without the skeletal system, the body's muscles would fall to the floor in a large pile and there would be no way for oxygen to be transported around the body.
In humans, the skeletal system is divided into two main parts - the axial skeletal and the appendicular skeleton. The axial skeleton consists of the cranium, spine, and ribs, while the appendicular skeleton is the arms and legs, and their points of attachment.

The diagram shows a generalized human skeleton. Remember, there are many other animals (the vertebrates) that have internal skeletons. These may have the same, or very similar bone structure and function. Additionally, there are other skeletons that are not made from bone. Many invertebrates have some form of skeleton that offers them support. Insects have an exoskeleton that is made of a substance called chiton. Sponges use a collection of fibers called spicules to give them structure.

The bones labeled are as follows:
A - cranium (skull) B - mandible
C - clavicle D - scapula
E - sternum F - humerus
G - costae (ribs) H - vertebrae
I - pelvis J - pubis
K - radius L - ulna
M - carpals N - metacarpals
O - phalanges P - femur
Q - patella R - fibula
S - tibia T - tarsals
U - metatarsals V - phalanges

There is a lot of variety when it comes to providing animal support.


Directions for this Lesson: Answer the practice questions and then watch the video to learn more about how the skeletal system functions.

Required Video: