Body Systems - 3.5 Muscles and Bones [ARCHIVE] Flashcards
What is your skeleton?
Your main frame, it is made up of bones.
What is your skeleton’s main functions?
- supporting your soft tissues
- protecting your organs
- allowing movement
Why does your skeleton need to support your soft tissues?
As it allows our body to remain its shape.
What part of the skeleton helps protect your organs?
The axial skeleton, which is made up of 80 bones (including skull, vertebrae, ribs, sternum and breastbone).
What part of the skeleton allows movement?
The appendicular skeleton, which is made up of 126 bones (including pelvis, shoulder blades, collarbones and bones in arms and legs).
Why do bones need to be strong?
So they don’t snap or crumble in daily activity.
What do compression and tension forces do to your bones and what are examples of this?
Compression forces squash bones, like with your legs when you are standing.
Tension forces stretch bones, like in your arms when you are holding something.
Why do bones need to be slightly elastic?
They need to twist and return to their normal shape when force is removed.
Why do bones need to be light?
So your muscles can move, the strength and lightness comes from the structure.
What are the two different forms of bone tissue?
- Compact bone
- Spongy bone
What is compact bone?
The dense outer layer of the bone that provides most of its strength.
What does spongy bone do?
It is light yet provides a strong inner structure to the bone.
What is bone marrow?
A fatty, jelly-like substance in bones where red and white blood cells and platelets form.
What is the substance that makes the bone hard and elastic?
Calcium phosphate - hard.
Collagen (which is in calcium phosphate) - elastic.
What do blood vessels supply bones with?
Nutrients they require.
