Skeletal System

Organ Systems of the Body

Functions Of The Skeletal System

1) Support- The Skeletal system help with the body's framework. The soft tissue from the body hang frame the skeletal framework.

2) Protection- Bones help protect delicate organs and structures. Example: The skull protects the brain.

3) Movement- The joints in the Skeletal Structure make movement possible. As muscles contract and shorten they pull on bones.

4) Storage- The bones help maintain homeostasis of blood calcium. Blood calcium is needed for muscle and nerve function. The bones help store the calcium and keep it safe. When blood calcium decreases it goes the opposite way. It removes the calcium from the bones.

5) Hematopoiesis- Is the process of blood cell formation. This is a vital process carried in red bone marrow. Red bone marrow is soft connective tissue in the hard wall of the bones.

Organs of Skeletal System

  • Cartilage- It is similar to bones, but in some ways it is not. Innumerable collagenous fibers reinforce the matrix of both tissues. In cartilage the fibers are in a firm gel rather then calcified cement, like in bones. Making Cartilage flexible. It can also rebuild its self after an injury. The main function of cartilage is to hold bones together in the skeletal system.
  • Types of Bones- There are 4 major types of bones. Long like humerus/arms. Short like carpal/wrist bones. Flat like frontal/skull bone. Irregular like vertebrate/spinal bone. Most of the important bones in the body are classified under long bones.
  • Ligaments- Cords made of the same tissue as the joint capsule, they lash the two bones together more firmly.
  • Joints- There are three different types of joints. Synarthroses, Amphiarthroses, and Diarthroses. Synarthroses means no movement. Amphiarthroses means slight movement. And Diarthroses means free movement.

Organs of The Skeletal System

Homeostatic imbalances


  1. Bone Fractures- The medical term for a broken bone.
- Bone Fractures occur when physical force is stronger then the bone itself. Some types of cancer can cause bones to fracture more easily. (Examples- traumatic injuries, sporting injuries, and falls.)

- Symptoms of a bone fracture are : swelling/bruising, deformity of bone, pain in injured area that gets worse as pressure is applied, loss of function of injured area, and in some fractures the bone may be protruding from the skin.

- Treating a fractured bone usually needs emergency treatment. The bone needs to be set back into place in order for it to heal properly. This sometimes may require reduction surgery. (surgery moving bone back to place) Most only need closed reduction surgery. (Re positioning the bone without surgery)


2. Rheumatoid Arthritis- Inflammation of the joints (area were 2 bones meet).
- Rheumatoid Arthritis is caused from the joints swelling.

- Some of the many symptoms of Arthritis are: fatigue, joint pain, joint tenderness, joint swelling, joint redness, joint warmth, and stiffness of joints.

- Rheumatoid Arthritis can be treated by maintaing a healthy weight, exercising. It also helps to use special devices to assist your arthritis.


3. Osteomalacia- Softening of bones.

- Osteomalacia is caused from lack of vitamin D. Also is caused from a body's problem to break down use of vitamins.

- The symptoms of osteomalacia are: bone fractures, muscle weakness, hard time walking, and bone pain.

- Treating osteomalacia means taking vitamin D supplements, or calcium supplements. (depending on the individual). Vitamin D also can be injected in the skin or through a vien.

Current Event

In this article scientist decided to study different diets and how they affect different people; and how they affected the bones. The three different test subjects each had a different diet. The first diet was called AAD. Meaning Average American Diet, This diet had 34% total fat. The second diet was the omega-6 rich diet. This diet included 37% of total fat. Lastly the third diet was called omega-3 ALA- rich diet. This diet included 38% total fat. In the end ALA significantly decreased the bone resorption. They did however figure out that walnuts do help with the bone nutrients.


Link: "Walnuts give bones a boost." Health24. N.p., 19 Jan. 2007. Web. 22 Sept. 2014. <http://www.health24.com/Diet-and-nutrition/News/Walnuts-give-bones-a-boost-20120721>.