Articulations, the connections between bones, provide the fundamental activity of the skeletal system; they allow for body mobility and flexibility. Because the main function is to provide mobility, there are different types of articulations that provide various motion ranges. In addition to this, another important function is the reduction of friction between the bones.
The presence of pores in the bones is the effect of bone damage and is provoked by reduction in bone tissue due to the lack of protein; one such example is the calcium mineral. As a result, the bone is less resistant and more fragile than normal, has less resistance to falls and breaks fairly easily, producing micro-fractures and fractures. The mineral density in the bones is measured by means of a medical test called bone densitometry.
This medical problem is usually found in women suffering from post menopause due to the reduction of estrogen production in the ovaries and hormone deficiencies. Other factors that increase the loss of calcium are the use of tobacco and alcohol, and a sedentary life. Doing regular physical exercise and increasing calcium intake before and after menopause, favors the skeletal system.