Skeletal System!

" The hip bones connected to the thigh bone... The thigh bones connected to the .... bone!!! "


Why do we have a skeletal system? Simpily because if we didnt we would be a big blob of skin and gross stuff...

There are many bones in our head that I never knew about...



We need bone structure over our brain because without it all of our knowledge would be gone.... This is just simply said!!

Bones protect all of our insides in other words.

Inside bones contain the main blood supply... We have bone marrow. Inside our bones is a matrix which consists of osteocytes in lacunae...To have healthy bones we need plenty of calcium!!! Think about it how would we eat meat without teeth... Blend it? I dont think so yuck!!
Bones are the structure to keep our organs safe and keep us mobile! Without bones just imagine how life would be :(

These are just some of the bones in our body!!!


Here is a video that I got more explination from hope it helps you also!! enjoy!!

http://www.youtube.com/watch?v=yFJ4iswRiu4
http://www.youtube.com/watch?v=TnY6l9hMOew


here is just a fun one!!

http://www.youtube.com/watch?v=IIjj0rC7wcQ

Skin!

Defnitions ....

-Epidermis is the outter nonvascular nonsencitive layer of the skin covering the true skin or corum.

-Dermis is the dense inner layer of skin benieth the epidermis. This is composed of connective tissue, blood and lymph vessils, sweat glands, hair folicules and a sencory nerve network!

-Hypodermis is an underlayer of epithelial vells in arthropods and certain other invertebrates that secretes substances for the overlying cuticle or exoskeleton.

For the defnitions ^^^ I used Dictionary.com!

Muscle Contraction, Sliding Filament Theory

This is a good link to a youtube video on The Muscular system, sliding fliamement theoryhttp://www.youtube.com/watch?v=EdHzKYDxrKc

and another
http://www.youtube.com/watch?v=0kFmbrRJq4w


When actin filaments (the light bands in the diagram above) slide over myosin filaments (the dark bands) the H-zone and I-band decrease. 
What causes actin filaments to move? 
Myosin filaments contain tiny globular heads, called cross bridges at regular intervals.  These cross bridges attach to the actin filaments pulling on them to create movement. 

See figure 2 below:





Each flexion of a cross bridge produces only a very small movement in the actin filament so many cross bridges throughout the muscle must flex repeatedly and rapidly for any measurable movement to occur.


On this theory I honestly was pretty confused I plan on coming back but I wanted to post something in my portfolio for now... I refered to  http://www.sport-fitness-advisor.com/sliding-filament-theory.html