The ribs, sternum and scapulae are all what type of bone?

Correct Answer: B

Rationale: Ribs, sternum, and scapulae are flat bones, characterized by their thin, broad structure. Flat bones provide protection (e.g., ribs for lungs) and surfaces for muscle attachment (e.g., scapulae). They aren’t long (elongated), short (cuboidal), or irregular (complexly shaped).

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: A

Rationale: The coccyx (tailbone) consists of four small vertebrae that fuse in adulthood into a single structure. The sacrum, while also fused (five vertebrae), is larger and supports the pelvis, making 'coccyx' the better fit for 'very small.'

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.