What do the orbits house?

Correct Answer: C

Rationale: The orbits are the bony sockets in the skull that house the eyes, protecting and positioning them. The nose and ears have their own distinct structures (nasal cavity, auditory canal) separate from the orbits.

Correct Answer: B

Rationale: Ribs decrease in length from 8 to 12 as they curve around the chest; rib 8 is longer, while ribs 11 and 12 (floating) are shortest, reflecting their reduced role in enclosing the thorax.

Correct Answer: B

Rationale: The radius is wider distally (near the wrist) and tapers proximally (toward the elbow), aiding wrist movement. Thus, it goes from wide to thin 'down' the arm toward the elbow.

Correct Answer: A

Rationale: Yes, an interosseous membrane connects the tibia and fibula along their lengths, similar to the forearm, providing stability and a surface for muscle attachment.

Correct Answer: C

Rationale: The shoulder joint (glenohumeral joint) is a ball-and-socket joint, where the humerus’s rounded head fits into the scapula’s glenoid cavity, allowing a wide range of motion (e.g., rotation, abduction). Hinge joints (e.g., elbow) allow one-plane movement, pivot joints (e.g., atlas-axis) rotate, and saddle joints (e.g., thumb) have a different articulation.