Let's simply learn about two little heroes that build our skeleton: Osteoblasts and Osteoclasts!

Have you ever thought about your bones? We often think of them as strong, unchanging things. But that's not the case. Our bones are living tissue , just like the rest of our bodies. You might not think so, but they are constantly growing, breaking down, and being replaced, not just from childhood to adulthood, but for the rest of our lives! Two very important types of cells that help with this amazing work are called `Osteoblasts` and `Osteoclasts`. Let's talk a little more about these two today, shall we?

Who are `Osteoblasts`? What do they do?

Simply put, `Osteoblasts` are the "Mason Jars" that build our bones. Sometimes they are also called `osteogenic cells`. They are the ones that strengthen our bones, and they are the ones that make new bones. `Osteoblasts` have three main functions:

• Building new bones ( bone formation).
• As we age, that is, as we grow from childhood to adulthood, our bones change to fit our body shape, a process called `remodeling`.
• Healing bones when they are broken, fractured, or injured .

Imagine, when one of our bones needs to grow, change in some way, or heal after being broken, these `Osteoblasts` cells are stimulated by various chemical reactions inside our body, or by `hormones`. Then these `Osteoblasts` cells come together and make and release a special mixture called `bone matrix` . This `bone matrix` is made up of `proteins` like `collagen` and `calcium` and `phosphate`, which are very important minerals for our bones. This work is like someone who pours `concrete` when building a road. He can build a brand new road. Or he can use that same `concrete` to fill in the cracks and breaks in an old road. Similarly, `Osteoblasts`, the `Masons`, use this `bone matrix` `concrete` to build new bones, strengthen old ones, and heal broken ones. After the new bone tissue is built in this way, some `Osteoblasts` cells become part of that new bone. They are then called `Osteocytes` . Otherwise, when their services are no longer needed, those cells die.

Let's learn a little about those called `Osteocytes`?

Osteocytes are like the "security guards" inside our bones.Like. Our bones are mostly made up of these `Osteocytes` cells. They are constantly watching what kind of pressure or pressure is being applied to our bones. When we walk, run, or lift something, even if there is a big impact like a bone breaking, these `Osteocytes` feel it. At that time, they are the ones who send signals to both `Osteoblasts` (those who build) and `Osteoclasts` (those who break - we'll talk about it later) saying, "Here's a problem, come and fix it." For example, if a bone cracks or breaks, `Osteocytes` are the ones who quickly bring other cells to the area, remove the broken pieces, and help build new bone and heal it.

So what kind of cells are `Osteoclasts`?

Osteoclasts are the "cleaning crew" that dissolves and removes old, damaged cells from our bones. It's like a demolition crew. They're the ones who make way for osteoblasts to build new bone.

An easy way to remember is: `Blasts` are like `Builders`, `Clasts` are like `Cleaners`.

Osteoclasts release special enzymes. These enzymes dissolve and break down old bone. They cause chemical reactions on the surface of old bone tissue, dissolving those fragments and making way for new, stronger tissue to form. But when osteoclasts dissolve bones, it's not like acid eating away at a piece of metal like in a cartoon. This process is very controlled and precise . Osteoclasts only dissolve the areas that the previously mentioned osteocytes (security officers) have marked as "this is where we need to remove it." The enzymes released by osteoclasts break down the strong bone matrix and reabsorb its contents. Then, small pits form on the surface of the bone. Once those holes are formed, the ``Osteoblasts`` (builders) come in and fill in the gaps with new bone. It's like a team effort!

What do these `Osteoblasts` and `Osteoclasts` cells look like?

Both of these cells are very small and are found in the outer covering (`bone lining`) of our bones and inside the bones themselves.

• Osteoblasts are usually small, cube-shaped cells.
• Osteoclasts are slightly larger than bone cells. They are spherical, dome-like in shape.

What are the common diseases that affect the function of these cells?

Osteoblasts and osteoclasts are two very important parts of our bones. So, any disease that affects our bones can also affect the function of these cells. Here are some of the main problems that prevent our bones from building and maintaining strength:

• Osteoporosis - This is when the bones become thin, weak, and break easily.
• Osteopenia - This is a precursor to osteoporosis. The density of the bones begins to decrease.
• Hyperparathyroidism - Excessive production of hormones by the parathyroid glands, causing calcium to be removed from the bones.
• `Paget's disease of the bone (osteitis deformans)` - In this condition, the process of bone repair is disrupted, causing the bones to become weak and deformed.

Are there any special tests to find out about these cells?

There are usually no specific tests to check how well your osteoblasts or osteoclasts are working. Doctors usually test the health of the entire bone, rather than looking at specific cells. However, sometimes, blood tests (labs) may be done to check how well your osteoclasts are working or to help diagnose a condition like osteoporosis. Here are some common tests to check the health of your bones:

• Bone density test (DXA scan) : This uses low-level X-rays to measure how strong your bones are. It can help determine if your bones are thinning as you age, or if you have symptoms of osteopenia or osteoporosis.
• Vitamin D test (` Vitamin D 25-hydroxy test`) : Checks whether you are getting enough `Vitamin D`.
• Calcium test : This checks the level of calcium in your blood, and can also check how much calcium is in your 24-hour urine.
• `Intact parathyroid hormone (IPTH)` test : Checks parathyroid hormone levels.
• Creatinine test : This checks whether your kidneys are working properly.

What should we do to keep our bones healthy?

There are several things you can do to keep your bones healthy and strong. Here are some things you can do:

• Eat a good nutritious diet , especially foods rich in calcium and vitamin D.
• Do weight-bearing exercise . That is, exercise that puts weight on your bones, such as walking , running, and climbing stairs.
• Avoid smoking completely . Smoking is very harmful to bones.
• Get enough calcium and vitamin D.Be careful whether you are getting enough. If necessary, take supplements under medical advice.
• Get regular medical checkups . If you feel any illness or change, see a doctor immediately.

What is the difference between `Osteoblasts` and `Osteocytes`?

Both `Osteoblasts` and `Osteocytes` are cells that help build and maintain our bones. But there is a slight difference.

• Osteoblasts are the cells that build new bone, grow existing bone, and repair it. They are the ones that release the bone matrix and build new tissue.
• Osteocytes are cells found within mature bone tissue . They are the ones that sense the pressure and stress on the bones and send signals to the osteoblasts and osteoclasts, saying, "There's a problem here, it needs to be fixed."

Finally, what to remember (Take-Home Message)

Now you understand how these two little cells called `Osteoblasts` and `Osteoclasts` have a huge impact on the health of our bones. They constantly work together, helping our bones grow, renew, and stay strong. Like unsung heroes.

It is especially important for people over the age of 65, women who have gone through menopause, and those with chronic medical conditions to seek medical advice and undergo regular medical checkups. This allows doctors to monitor your bone health and detect early signs of bone loss or osteoporosis.

So, take care of your bones too. Eating well, exercising, and living a healthy lifestyle are the most important things!