ATI RN
Questions for Skeletal System Questions
Question 1 of 5
Hyaline cartilage does not have
Correct Answer: D
Rationale: Hyaline cartilage is avascular (lacks blood capillaries), contains cells (chondrocytes) in lacunae (spaces), but does not have prominent fibers like elastic or fibrous cartilage. Its matrix is smooth and glassy, making ‘fibres’ the correct feature it lacks.
Question 2 of 5
The 'sternum' is a very important bone that protects the
Correct Answer: B
Rationale: The sternum (breastbone) is a flat bone in the chest that, along with the ribs, forms the rib cage, primarily protecting the heart. It also shields the lungs to some extent, but its central role is heart protection. The brain is protected by the cranium, and the liver is below the diaphragm.
Question 3 of 5
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.
Question 4 of 5
Which of these is composed of very small vertebrae that have fused?
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.'
Question 5 of 5
Ribs are flat bones. Do they get longer or shorter going from 8 to 12?
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.