Skeletal System

Skeletal System

All the bones in the human body together are called the skeletal system. The skeletal system provides strength and rigidity to our body so we don't just flop around like jellyfish. We have 206 bones in our body. Each bone has a function. Some bones offer protection to softer more fragile parts of body. For example, the skull protects the brain and the rib cage protects our heart and lungs. Other bones, like bones in our legs and arms, help us to move around by providing support for our muscles.

The skeletal system includes more than just bones. It also includes tendons, ligaments, and cartilage. Tendons attach our bones to muscles so we can move around. Ligaments attach bones to other bones.

What are bones made of?

Around 70 percent of your bones are not living tissue, but hard minerals like calcium. The outside of the bone is called the cortical bone. It's hard, smooth, and solid. Inside the cortical bone is a porous, spongy bone material called the trabecular or concellous bone. This bone is lighter allowing for the bone itself to be lighter and easier for us to move around. It also allows room for blood vessels and makes our bones slightly bendable. This way our bones won't break so easily. At the center of bones is a softer substance called marrow.

Bone Marrow

There are two types of bone marrow, yellow and red. Yellow bone marrow is mostly fat cells. Red marrow is important because this is where our body produces red and white blood cells. When we are born, all of our bones have red marrow. By the time we are adults about half of our bones have red marrow. Joints

Our bones come together and connect at special places called joints. Your knees and elbows are joints, for example. Many joints have a large range of movement and are called ball and socket joints. The shoulder and hip are ball and socket joints. Joints have a smooth, durable material called cartilage. Cartilage, together with fluid, allows bones to rub against each other smoothly and not wear out.

How do broken bones heal?

Your body can heal broken bones all on its own. Of course, a doctor will help it along, making sure that the bone heals straight and properly using a cast or sling. A broken bone will heal in stages. When it first breaks there will be blood around it and it will form a sort of scab over the broken portions. Next, tougher tissue will start to grow over the broken area called collagen. The collagen, together with cartilage, will bridge the gap between the two sides of the break. This bridge will continue to transform and harden until the bone is healed. It can often take months for bones to heal back to normal. While the bone is healing, it can't take the stress of a normal bone, which is why people use crutches and slings to take the pressure off the bone while it's healing.

Fun facts about bones for kids .The smallest bones are in the ear. .Although your bones stop growing when you are around 20, they do constantly rebuild new bone cells. .The spine is made up of 33 bones. .Red bone marrow can produce around 5 billion red blood cells each day. .Very few man made substances can come close to the lightness and strength of bones. If your body doesn't have enough calcium, it will take it from your bones making your bones weaker. A good reason to drink your milk!

Bones in your body are filled with a substance called marrow. Marrow is a soft, gelatinous material found in the hollow center of bones and is responsible for producing blood cells and storing fat.

above (slightly slightly to the right also)

206 bones in human body

The skull contains what we call the eye socket or orbit. There are seven bones that articulate to form the orbit: frontal bone, lacrimal bone, ethmoid bone, zygomatic bone, maxillary bone, palatine bone and the sphenoid bone.

The palatine bones form the roof of the mouth.

The atlantoxial joint is formed by the first and second cervical vertebrae, known as the atlas (C1) and axis (C2) respectively. It allows for rotational movement of the head.

Hyaline cartilage covers the ends of bones in many joints. It provides a slippery surface to reduce friction during bone movement.

The soft tissue at the center of bones is known as bone marrow. It is responsible for producing blood cells and storing fat.

You should always be concerned with bone strength. Get the recommended daily allowances of calcium and vitamin D - usually drinking milk is enough! - and exercise regularly. Definitely by middle age, you should really be thinking about it.

The cranium whish is basicly part of your scull

Bones are made up of a matrix of collagen fibers and calcium crystals, which provide both flexibility and strength. The hollow structure of bones, filled with marrow, also contributes to their lightweight nature. Additionally, the arrangement of compact and spongy bone tissues distributes forces and enhances the bone's ability to withstand compression and tension.

Examples of slightly movable joints in the body include the ribs and the joint between the two bones of the lower leg (tibia and fibula). These joints allow for limited movement, such as expansion of the ribcage during breathing and small movements between the two bones of the lower leg.

No, obtaining oxygen is not a function of the skeleton. The skeleton provides support, protection for internal organs, assists in movement, and serves as a storehouse for minerals. Oxygen is obtained and distributed through the respiratory and circulatory systems.

pinky for both

In our joint cavities, there is a fluid known as synovial fluid. It allows the joints to move freely and serves to reduce friction that can occur when joints move together. It is made up of hyaluronic acid.

The shoulder and hip joints are the only ball-and-socket joints in the human body due to the need for great motion at the end of the body’s limbs and the vast numbers of muscles needed to move and support such flexible joints. In the shoulder joint, the spherical head of the humerus (upper arm bone) fits into the glenoid cavity of the scapula (shoulder blade). The glenoid cavity permits the shoulder joint the greatest range of motion in the human body. The muscles of the rotator cuff hold the humerus in place.The hip joint is somewhat less moveable than the shoulder, but is an overall stronger and more stable joint. That is necessary to bear the weight of the body resting on the legs while performing actions such as standing, walking, and running. In the hip joint the rounded, almost spherical head of the femur (thigh bone) fits tightly into the acetabulum, a deep socket in the os coxa (hip bone). The largest muscle in the body is found here: the gluteus maximus. Many tough ligaments and the powerful hip muscles hold the head of the femur in place and resist some of the most powerful strains in the body. The depth of the acetabulum also prevents dislocations of the hip by limiting the movement of the femur in its socket.

Without tendons, you wouldn't be able to move your bones effectively. Tendons are crucial in connecting muscles to bones and transferring the force generated by the muscles. Without tendons, your muscles wouldn't be able to move your bones, leading to immobility and loss of function.

Snails protect themselves by carrying a hard shell on their backs, which serves as a form of armor. They also produce a slimy mucus that helps to keep their bodies moist and protected from dehydration. In addition, snails have a muscular foot that allows them to cling to surfaces and retreat into their shells for protection.

A homologous structure to a human arm bone would be the forelimb bones in other mammals, such as the forelimb bones in a bat or a whale. These structures may have different functions (e.g. for flying or swimming), but they share a common evolutionary origin with the human arm bones.

Calcium phosphate is a bone-like substance that has 9 letters.

If we did not have a spine, we would be floppy and if you sat down, you would look like liquid. But you need a spine to live.

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Though, some 'persons' could be considered as quite 'spineless' (characteristically not anatomically).

The cartilaginous tip of the sternum is also known as the xiphoid process. It is a small, cartilaginous extension at the bottom of the sternum and serves as an attachment point for some abdominal muscles. The xiphoid process can vary in shape and size among individuals.