Ossification is the process by which bones are formed and there are two types of bone formations. According to our Wiley textbook Intramembranous ossification, one of the types of bone formations, happens when osseous tissue forms directly within mesenchyme arranged in sheet like layers that resemble membranes. In the second method, endochondral ossification, osseous tissue forms within hyaline cartilage that develops from mesenchyme. Intramembranous being the simplest type of bone formation.
As people age, the bone density that we once had starts to diminish, known as osteoporosis. Osteoporosis is a disease of the bones, more common in women, where you loose bone density. This disease causes bones to become weak and can break easily. This is dangerous for elderly people because a simple fracture can cause many difficulties for them known as the 3 Cs for Dr. Garcia.
The reason why we cannot stop the changing of bone growth as we age is because of the types of cells we have in our bone tissues. According to The Basics of Bone in Health and Disease both modeling and remodeling involve the cells that form bone called osteoblasts and the cells that break down bone, called osteoclasts. Osteoclasts are huge cells, which destroy, or breakdown the bone matrix. Remodeling is the main way that the bones in the human body change.
Bones are not the only things that change as we age, as mentioned before, muscles also change. As we grow older, muscles mass decreases, adults lose 3% to 5% of muscle mass and 1% to 2% after the age of 50. Muscle tone also changes, as we grow older. The decrease in muscle tone occurs as we age mostly because of lifestyle chances, according to Holly Ridgeway of Gaiam life website. Muscle fibers also shrink and are replaced with a tough fibrous tissue.
In conclusion, all of these issues combined can affect the growth of our body. Bones become more delicate, causing them to break easily. Your height may decrease because of the pressure in the discs and the shortening of the trunk and spine. Because your muscles are also changing, movements may slow down and become limited causing you to slow down in walking or moving. The loss of muscle mass reduces your strength causing you to be weaker than you were before. All which can lead to injury. To prevent all of this, it is recommended to exercise and maintain a well-balanced meal.
* Steven Dowshen, MD. (August, 2009). Your Muscles. In Kids Health. Retrieved October 29, 2012, from http://kidshealth.org/kid/htbw/muscles.html#. * Office of the Surgeon General (US). Bone Health and Osteoporosis: A Report of the Surgeon General. Rockville (MD): Office of the Surgeon General (US); 2004. 2, The Basics of Bone in Health and Disease. Available from:
http://www.ncbi.nlm.nih.gov/books/NBK45504/ * Jenkins, G. (2010). Anatomy and physiology : from science to life. Hoboken, NJ: John Wiley & Sons.