![]() The skeleton is the site of haematopoiesis, the development of blood cells that takes place in the bone marrow. The rib cage, spine, and sternum protect the lungs, heart and major blood vessels. ![]() The skeleton helps to protect many vital internal organs from being damaged. Shifting from hunting to agriculture has caused human bone density to reduce significantly. It is believed that the reduction of human bone density in prehistoric times reduced the agility and dexterity of human movement. Muscles, bones, and joints provide the principal mechanics for movement, all coordinated by the nervous system. Movement is powered by skeletal muscles, which are attached to the skeleton at various sites on bones. the ball and socket joint allows a greater range of movement than the pivot joint at the neck. The joints between bones allow movement, some allowing a wider range of movement than others, e.g. Without the rib cages, costal cartilages, and intercostal muscles, the lungs would collapse. The pelvis, associated ligaments and muscles provide a floor for the pelvic structures. The skeleton provides the framework which supports the body and maintains its shape. The skeleton serves six major functions: support, movement, protection, production of blood cells, storage of minerals and endocrine regulation. Their functions are to make locomotion possible and to protect the major organs of digestion, excretion and reproduction. The appendicular skeleton (126 bones) is formed by the pectoral girdles, the upper limbs, the pelvic girdle or pelvis, and the lower limbs. Unlike most primates, human males do not have penile bones. The human female pelvis is also different from that of males in order to facilitate childbirth. In general, female skeletal elements tend to be smaller and less robust than corresponding male elements within a given population. The human skeleton is not as sexually dimorphic as that of many other primate species, but subtle differences between sexes in the morphology of the skull, dentition, long bones, and pelvis exist. The human skeleton performs six major functions: support, movement, protection, production of blood cells, storage of minerals, and endocrine regulation. ![]() The appendicular skeleton, which is attached to the axial skeleton, is formed by the shoulder girdle, the pelvic girdle and the bones of the upper and lower limbs. The axial skeleton is formed by the vertebral column, the rib cage, the skull and other associated bones. The human skeleton can be divided into the axial skeleton and the appendicular skeleton. 10–11 kg for an average person) and reaches maximum mass between the ages of 25 and 30. The bone mass in the skeleton makes up about 14% of the total body weight (ca. It is composed of around 270 bones at birth – this total decreases to around 206 bones by adulthood after some bones get fused together. The human skeleton is the internal framework of the human body.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |