The Skeleton Function & Bones.

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Presentation transcript:

The Skeleton Function & Bones

Skeleton How many bones in the body?? Does anyone know any bones in the body??

Why do we have bones?? Support – if we had no bones we would be a pile of jelly!

Why do we have bones?? Movement – Allow use to walk, run etc. Protection – Protects our inner organs.

The Skeleton Types of Joints

Skeletal Joints Song https://www.youtube.com/watch?v=WHNO6D1Ee0Q

What are joints? Joints are where bones meet & they allow for movement. Some examples are the skull, hip, shoulder, knee, elbow.

Hinge Joints Allows movement in one direction only. Examples include the elbow & knee

Ball & Socket Joints Allow movement in many directions. Examples include the hip [between hip (socket) & top of femur (ball)] & the shoulder.

Fused Joint No movement between the bones that meet. An example is the skull. The skull protects your brain

Ligaments Join bone to bone

Questions. Name the 3 types of joints & their function. Give an example of each. What does the term ligament mean?

Structure of Synovial Joint The Skeleton Structure of Synovial Joint

Ligament! What is a ligament from the last class?? Ligament joins bone to bone.

Synovial Joint A movable joint. Examples include elbow, knee, hip.

Synovial Joint Structure

Cartilage = A shock absorbing cushion that prevents friction between the bones. Synovial Fluid = Lubricates the joint to allow for easy movement. *Cartilage can be found in the spine & prevents vertebrae rubbing off each other.*

Synovial Joint Structure

Draw a labelled diagram of the Synovial Joint in your copy.

The Skeleton Antagonistic Muscles

Antagonistic muscles video https://www.youtube.com/watch?v=A4Qcjzj3Zs8

Tendon Connects muscle to bone.

What does Antagonistic mean?? Antagonistic = Opposing/competing. Antagonistic muscles work opposite one another. They work in pairs

An Antagonistic Pair

Experiment. Hold your arm out straight. Which muscle contracted & which on relaxed?? The Bicep relaxed & the tricep contracted.

Experiment. Now hold your arm out straight & bend your elbow. Which muscle contracted & which relaxed? The Bicep contracted & the Tricep relaxed.

Define antagonistic muscle. What happens when you hold your arm out straight? What happens when you then bend your elbow? What is a tendon?