bone side. ♥

in the first week. ehem. my week. why? i reported. first on the list. PROUDLY PRESENTS:
the SKELETAL system. :D

i just said, 'okay okay. i'll report.' and that's it// reporting stage.

** start of the topic **

well skeletal system. what about them? skeletal system is a wonderful system that has different functions such as framework for the body, produces blood cells, provides protection for organs, helps us to breathe, gives mineral storage, and allows movement with the muscular system. arggh. my head aches. well. some asks, how does it help in breathing? it helps through the movement of the ribs. ribs can move according to how lungs move, the balloon-like thing. if ribs couldn't move, lungs may burst out so, thanks ribs. :)

of course, skeletal system is made up of bones. they can be compared as cells to tissues. :) okay okay. bones can construct and repair itself even if it looks like creepy dead. they are composed of minerals such as calcium and phosphorus that makes them strong. :D but look, skeleton is from a greek word meaning dried-up body. how ironic. haha!

there are different classifications of bones according to shapes. long bones, short bones, irregular bones, and flat bones -- self-explanatory. Ü

there is also bone anatomy - the basic version. every bone is covered with periosteum, a tough and fibrous tissue. bone ends are called epiphysis; while the region between the two ends is diaphysis. inside the bone, medullary cavity is a cavity where bone marrow are stored. speaking of bone marrow, there are two types of bone marrow: yellow and red. yellow bone marrow has high fat content and can be converted to red bone marrow in case of emergencies occur. on the other hand, red bone marrow are the ones that produces red blood cells. i think they refer the types to what they produce. :)

meanwhile, there are two types of bones tissues, the compact and spongy. compact bone tissue is a dense, hard tissue that normally composes the shafts of long bones and outer layer of some bones. in this bone tissue, osteon or haversian systems are the materials that form microscopic cylindrical-shaped units. in addition, spongy or cancellous bone tissues are arrange in bars and plates called trabeculae. it has irregular holes that makes it look spongy.

bones also grow. :) ossification is the term for the formation of the bones in the body. in this, there are four kinds of bone cells that are involved -- osteoprogenitor cells, osteoblasts, osteocytes, and osteocytes. osteocytes are nonspecialized cells that can turn to other type of bone cell if needed. second is the osteoblasts or the cells that form bones. next is the osteocytes or the mature osteoblasts. and the last is osteoclasts or the tearer of bone material to distribute calcium && phosphorus in the body.

there is also cartilage. it works as a mat to avoid bones meet and be inflamed. on the other side, joints are made when two bones are joined together by ligament. ligament is different with tendons because tendons are attached from muscle to bone.

// and that's what i've learned. :D