Biology 30S (11-3) - 2009/2010

hey ladies! okay so last class we went over the anatomy of the bone and also the functions of the skeleton. so incase you missed some of the facts ill briefly summarize what we went over last class :)


the 3 types of tissue are
1) bone, cartilage, and dense fibrous connective tissue

Longbones are covered by periosteum and there are 2 types of longbone which are
- epiphysis- which is the widened end of the long bone
-diaphysis- which is the shaft of a long bone

there are 2 types of cells which are
- osteoclasts which break down matrix and release calcium to blood, which takes 3 weeks
- ostioblasts which pick up calcium from blood and deposit it in a new bone matrix.
--> one way to remember which one is which is if you think osteoclast which sounds like osteoCRASH which would break down :) thats the way i think of it

The functions of the skeleton are
1) structural support
2) protection of soft body parts ----> ex. skull, rib cage
3) protection of blood cells ---------> ex. red bone marrow in ends of longbone, sternum, pelvis
4) storage of minerals and fat-------> ex. calcium phospate in bone matrix, fat in yellow marrow
5) Locomotion - along with muscles

So in class we didnt get around to watching the Hannah Montana Bone dance cuz the internet was down so i heres a link cuz it could help learning the bones :)

http://www.youtube.com/watch?v=3Waxf9KZWpM

Also i think maria asked in class if there what the diffferences were between the girls skeleton and the guys so i found out :)

The main difference between a girl and guys skeleton is the pelvis, because of course the whole childbirth thing. So the womans pelvis is flatter and more rounded . Men have thicker bones, longer limbs and phalanges. while women have smaller ribcages, smaller teeth, less defined facial features such as ur eyebrows and also the small bumb at the back of your head is smaller than men. Also the forearm is shaped differently then a guy, and we also have rounder shoulder blades.

hope this helped :)