Study "skeletal system", a flashcard deck on FORKSAI.
THEORETICAL: Explain how the structural arrangement of osteons within compact bone contributes to its maximum strength.
Osteons, or Haversian systems, in compact bone are arranged to run parallel to the long axis of the bone. This specific orientation provides the bone with its maximum strength and makes it hard and densely packed, enabling it to withstand significant stress and force.
MCQ-STYLE: Which of the following is a primary function of the axial skeleton?
A
DEFINITION: Distinguish between the diaphysis and epiphysis of a long bone based on their structure and primary contents.
The diaphysis is the shaft of the long bone, a hollow cylinder of compact bone surrounding a medullary cavity used for fat storage (yellow bone marrow). The epiphysis refers to the enlarged ends of the bone, consisting of compact bone on the outside, covered with cartilage, and spongy bone on the inside with spaces filled with red marrow for blood cell production.
THEORETICAL: How does the classification of bone as a connective tissue relate to its microscopic structure?
Bone is classified as a connective tissue because its cells, osteocytes, are not close together and are separated by large amounts of non-cellular matrix. In bone, this matrix is particularly significant due to the deposition of inorganic salts of calcium and phosphate, which increase its rigidity and strength, making it the hardest of the connective tissues.
MCQ-STYLE: A young person consuming anabolic steroids might experience which of the following effects on their bone growth and height?
B
DEFINITION: What is the periosteum and where is it absent in the macroscopic structure of a long bone?
The periosteum is the dense, white, fibrous outer covering of the bone. It is absent at the joints, where the bone is instead covered with articular cartilage to facilitate smooth movement.
THEORETICAL: Explain the dual role of bone marrow in the human skeleton.
Bone marrow plays a dual role: red bone marrow, found within the spongy bone of the epiphysis, is responsible for producing red blood cells. Yellow bone marrow, located in the medullary cavity of the diaphysis, serves as a site for energy storage in the form of fat.
MCQ-STYLE: Which mineral is primarily stored in bones and can be released to the rest of the body as needed?
C
THEORETICAL: How does the appendicular skeleton facilitate movement in conjunction with the axial skeleton?
The appendicular skeleton, comprising the bones of the limbs and the pectoral and pelvic girdles, allows for movement by providing points of attachment for muscles. The girdles specifically enable the articulation of the limbs with the axial skeleton, forming levers at joints that muscles can pull on to produce movement.
DEFINITION: Define the term 'articulation' as it relates to the musculoskeletal system.
In the musculoskeletal system, articulation refers to movement facilitated by bones serving as attachment points for muscles to pull on bones and forming levers at joints. This allows for a range of motions and is enabled by structures like the pectoral and pelvic girdles.