WGU AP D312 Lab Questions Sections 3-4

WGU AP D312 Lab Questions Sections
3-4

Bone Structure and Classification

Bone Cells and Matrix

 Osteocyte cells are entrapped in the bone matrix.

 Osteocytes play a crucial role in maintaining bone structure and function.

 These cells are connected through small channels in the bone called canaliculi.

 Osteocytes are derived from osteoblasts that have become embedded in the bone
matrix.

 They are essential for bone remodeling and repair.

Long Bone Structure

 The diaphysis (labeled D) in a long bone is mostly comprised of compact bone.

 Compact bone provides strength and support to the long bone.

 The diaphysis is the shaft of the long bone, primarily composed of tightly packed tissue.

 It contains the medullary cavity, which stores bone marrow.

 The diaphysis is crucial for weight-bearing and locomotion.

Bone Classification and Anatomy

 Irregular shaped bones, like the one labeled D, have complex shapes and functions.

 Flat bones, such as those labeled A and B, provide protection and muscle attachment
sites.

 The axial skeleton includes the skull, vertebral column, and rib cage.

 The appendicular skeleton consists of the bones of the upper and lower limbs.

 The sternum, located at the anterior of the chest wall, is crucial for protecting vital
organs.

Human Skeleton and Vertebrae