Question

1. the (click to select) are found deep in the diaphyses of long bones and are filled with yellow

options:

• central canals
• medullary cavities
• lacunae
• perforating canals

Explanation:

Identify the anatomical structure

Using the Skeletal Terminology and Skeletal System Organization knowledge points:

• The question asks for the structure found deep in the diaphyses (shafts) of long bones that is filled with yellow bone marrow.
• The diaphysis of a long bone contains a hollow internal chamber.
• This central space is known as the medullary cavity (or marrow cavity).
• In adults, this cavity is primarily filled with yellow bone marrow, which consists mainly of adipose tissue (fat).

Evaluate the other options

• central canals: These are microscopic channels running longitudinally through the center of osteons in compact bone, containing blood vessels and nerves.
• lacunae: These are tiny spaces between lamellae in bone matrix that house osteocytes.
• perforating canals: These are microscopic channels that run perpendicular to central canals, connecting them to the periosteum and endosteum.
• Therefore, only medullary cavities fits the description of a large space deep in the diaphysis filled with yellow marrow.

Answer:

• central canals
• medullary cavities (Correct answer)
• lacunae
• perforating canals