Muscular system- came from the latin word mus, "mouse"





It has 3 types:

1.Cardiac-(voluntary) found on the walls on the heart
2.Skeletal-(involuntary) muscles which are attached to the bones
3.Smooth-(voluntary) commonly found on the walls of the internal organ

SKELETAL SYSTEM

Skeletal system is not only the framework of our body. It also has a lot of functions such as its provides protection, allows movement, produces blood cells , stores minerals, and it also helps us to breathe.

It can be classified in to four types; long bones, short bones, flat bones and irregular bones.

Bone tissue has two types compact which are found in the outer layer of the body while Spongy are lined with endosteum.





Cells are nedeed in the formation and growth of bones.


There are 4 types of cells.

• osteoprogenitor- formed in the periosteum, endosteum and central cell


• osteoblast-cells that actually form bones


• osteocytes-originally osteoblats sorround with fat


• osteoclast- tears down bown material.

Joints connects bones to bones it also allows movements. It has three structures namely Fibrous, Cartilage ans Synovial. Synovial can be furtherly divided into & types;

• Saddle- rocks up and down and side and side


• Candyloid-one place to another but no rotation


• Ellipsoidal-two axes of movement


• Pivot joints-rotates


• Ball and socket-rotation


• Hinge-open and close


• Gliding-back and forth

TISSUES

Tissues- is a collection of similar cells acting together to form a function.

tissue has 4 types according to their function

1. epithelial
2. connective
3. muscle
4. nervous

Epithelial tissues cover organ surfaces such as the surface of the skin.
It is also packed together.
We can classify Epithelial tissue through their shape and arrangement.
It has 4 shapes namely Squamous, Cuboidal, Columnar and Transitional

Squamous- is flat and scalelike

Cuboidal- is a tissue w/c is cube-shaped. Their width is approximately equal to their height.




Columnar- are tissue w/c are columnlike



Transitional - tissues w/c are variably shaped

Epithelial tissues are arranged into two kinds ; Simple and Stratified
In simple they are arranged in single layer while in stratified they are arranges in several layers.

Connective tissue- is the most common among the tissues. They are found throughout the body. They provide structure and support.

Connective tissues are divided into three;
Areolar tissue-w/c holds organs together
Adipose tissue-also known as fat
Dense connective tissue-they are densely packed and have cordlike structure.

Muscle tissue- are tissue that has the ability to shorten/contract.

it has 3 types

Skeletal muscle-tissues that causes movement by contracting and relaxing.
Cardiac Muscle- are tissues w/c are mostly found on the heart. It is involuntary which means it can't be controlled.
Smooth Muscle- are tissues which are found on the hollow tissues.

the last type of tissue is known as Nervous tissue. Nervous tissues acts as a rapid messenger service for the body.