A patient presents with difficulty breathing and wheezing. Which part of the respiratory system is most likely affected?

A. Ball and socket joints: Ball and socket joints, such as the shoulder and hip, allow for a wide range of movement in multiple directions. They are synovial joints with a fluid-filled cavity, not primarily connected by cartilage for limited motion.

B. Synovial joints: Synovial joints have a joint cavity filled with synovial fluid and permit free movement. They include hinge, pivot, and ball-and-socket joints, providing more mobility than partial-movement joints.

C. Cartilaginous joints: Cartilaginous joints are connected by cartilage, allowing limited or partial movement. Examples include intervertebral discs and the pubic symphysis, providing stability while permitting slight flexibility.

D. Fibrous joints: Fibrous joints are connected by dense connective tissue and allow little to no movement. Examples include sutures in the skull, which provide strength and protection rather than flexibility.

A. Long bone: The femur is a long bone characterized by a tubular shaft (diaphysis) and two expanded ends (epiphyses). Long bones function primarily in support, movement, and bearing weight, and they contain bone marrow for blood cell production.

B. Short bone: Short bones are roughly cube-shaped, such as the carpals and tarsals, and provide stability with limited movement. The femur does not fit this shape or functional classification.

C. Flat bone: Flat bones, like the sternum and skull bones, are thin and often protect internal organs. The femur’s cylindrical structure does not match that of flat bones.

D. Irregular bone: Irregular bones have complex shapes, such as the vertebrae, to serve specialized functions. The femur’s simple long shape distinguishes it from irregular bones.