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

Epitheal Tissues

Simple Squamous

Simple Cuboidal







Simple cloumnar








Pseudostratified columnar






Stratified squamous




Transitional

Body Regions

Homeostasis in my eyes

     Homeostasis is a very easy way of explaining how the body balances itself out; in scientific terms "Homeostasis is the ability to maintain a relatively stable internal environment in an ever-changing outside world. The process of Homeostasis contains chemical, thermal, and neural factors that interact.

     Receptors check out what the body is doing and responds to the changes. Once the receptors find what the body needs it "tells" the control center. The Control center receives the information from the Receptors and immediately reacts to the "value" of what the specific need is, after this job is complete with information the final step comes about. This final step is the Effectors, there job is to "read" the message from the Control center and break down what is needed for the body. With these three parts interacting a bigger picture comes in play. This "picture" is called Homeostatic mechanism, this is the process when homeostasis begins to tell the receptors what the stability is in the body. When this process is finished the receptors slowly shut down untill needed again, this is placing the body back in balance which is called Negative feedback. Negative feedback is what is supposed to happen through homeostasis. Rarely does positive feedback happen, Positive feedback only happens with a wound or during child birth.


Here is the lab that we did (better examples)