SYSTEM)- NSC215
1. Introduction to the Skeletal System:
The skeletal system serves as the structural framework for the
body, providing support, protection, and movement. It consists of
bones, cartilage, ligaments, and other connective tissues. Beyond
physical support, the skeletal system also plays essential roles in
hematopoiesis (blood cell production) and mineral storage,
particularly calcium and phosphorus.
2. Bone Structure and Function:
Bones are complex organs made primarily of collagen, calcium
phosphate, and other minerals. They are dynamic tissues
constantly undergoing remodeling, with functions including
support, protection of internal organs, facilitation of movement,
storage of minerals, and hematopoiesis.
3. Types of Bones:
Bones are classified into four main types: long bones (e.g.,
femur), short bones (e.g., carpals), flat bones (e.g., skull bones),
and irregular bones (e.g., vertebrae). Each type has distinct
shapes and functions.
4. Bone Development and Growth:
Bone development begins with the formation of cartilage models
in the fetus, which are gradually replaced by bone tissue through
ossification. Growth continues through childhood and adolescence
via processes such as endochondral ossification and appositional
growth.
5. Bone Cells and Tissues: