The Skeletal System -

Tiffany Guerra, Hannah Voss, Stephanie Ruiz

The skeletal system is a living, dynamic, bony framework of the body, with networks of infiltrating blood vessels.

The Structure of Bones

At birth, the human body has 350 bones. By adulthood, the body only consists of 206 bones because many bones fuse together. Bones stop growing and changing by the time a person reaches their 20's.
There are two different types of bone tissue: compact and cancellous. Compact tissue forms the outer layer of bone. Cancellous tissue, aka "spongy tissue", lays underneath compact tissue and forms the meshwork of layers that consist of bone marrow.
Vital organs are protected by the skeletal system. The brain is protected by the surrounding skull as the heart and lungs are encased by the sternum and rib cage. Bodily movement is carried out by the interaction of the muscular and skeletal systems.

The Function of Bones

There are mainly 6 functions of the skeletal system:
  1. Support
  2. Protection
  3. Assisting in movement
  4. Storage of minerals
  5. Production of blood cells
  6. Storage of chemical energy
The skeleton is the framework of the body, it supports the softer tissues and provides points of attachment for most skeletal muscles. The skeleton provides mechanical protection for many of the body's internal organs, reducing risk of injury to them. Skeletal muscles are attached to bones, therefore when the associated muscles contract they cause bones to move. Bone tissues store several minerals, including calcium (Ca) and phosphorus (P). When required, bone releases minerals into the blood. The red bone marrow inside some larger bones is where blood cells are produced. With increasing age some bone marrow changes from red bone marrow to yellowish bone marrow. Yellow bone marrow consists mainly of adipose cells and a few blood cells. It is an important chemical energy to reserve.

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Bone marrow
is a special, spongy, fatty tissue that houses stem cells, located inside a few large bones. These stem cells transform themselves into white and red blood cells and platelets, essential for immunity and circulation. Anemia, leukemia, and other lymphoma cancers can compromise the resilience of bone marrow. Bone marrow transplants are a growing treatment for these conditions of the lymphatic system that can't be otherwise cured.

- Did you know that humans and giraffes have the same amount of bones in their necks?! Giraffe neck vetebrae are just much longer!
- Your femur (thigh) is the longest bone in your body. It is about 1/4 of your height!
-The human hand has twenty seven bones and the face only has fourteen.
- You have over 230 moveable and semi-moveable joints in your body.

Q:Why is your skeletal system important?
A:Not only does it provide support for all the tissues and organs that make up the body, protection for the most important organs and allow movement as we know it; the skeletal system provides the birthplace of new red blood cells in the marrow of bone.

Q:How do you keep your skeletal system healthy?
A:By eating foods rich in calcium and vitamin d as well as exercising regularly.

Q:Is cartilage part of the skeletal system?
Yes, it forms part of the skeletal system in humans and in other vertebrates, and is also known as gristle.

Q:How much does the skeletal system weigh?
The skeleton of an average person accounts for about 20% of their total body weight whereas muscle accounts for about 40%.

Q:What is the biggest bone in our body?
The longest and strongest bone in the human body is the thighbone, or femur. In a man six feet (1.8 meters) tall, the femur would measure about 20 inches (51 centimeters) in length. Leg bones are very strong because they have to carry the weight of the body and move it from one place to another.


Other References

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Overall, the skeletal system is a key aspect in forming the human body. Not only does it make a human have structural support, it also produces blood and provides protection for the inner organs. Without the skeletal system there is no such thing as structure. And if there is not structure, then there is no such thing as function. Therefore, we could not be able to live the way we do without the skeletal system.