Question 1

Which of the following best describes the function of the axial skeleton?

Accepted Answer

It forms the rigid framework that supports the body and anchors muscles.

Question 2

A patient suffers a fracture in the shaft of their femur. Which part of the long bone is affected, and what is typically found inside this region?

Accepted Answer

Diaphysis; medullary cavity containing yellow bone marrow

Question 3

Which bone cell type is primarily responsible for bone resorption, and what is the process called?

Accepted Answer

Osteoclast; osteolysis

Question 4

Compact bone is organized into osteons. What is the main structural difference between compact and spongy bone?

Accepted Answer

Compact bone is made of concentric lamellae around a central canal, while spongy bone has an open network of trabeculae.

Question 5

During appositional growth, which process increases the diameter of existing bones?

Accepted Answer

Osteogenic cells differentiate into osteoblasts that add bone matrix under the periosteum.

Question 6

Which type of ossification forms most long bones in the body?

Accepted Answer

Endochondral ossification

Question 7

A child is diagnosed with achondroplasia. Which abnormality is most likely present?

Accepted Answer

Early replacement of epiphyseal cartilage by bone, resulting in short, stocky limbs

Question 8

Which hormone increases blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 9

What is the first temporary structure to form during bone fracture healing?

Accepted Answer

Fracture hematoma

Question 10

Which equation best represents the formation of hydroxyapatite crystals in bone matrix?

Accepted Answer

$$Ca_3$$($$PO_4)_2 + Ca(OH)_2$$ \rightarrow Ca_{10}($$PO_4)_6(OH)_2$

Question 11

Which two organs are most important in regulating blood calcium levels?

Accepted Answer

Bones and kidneys

Question 12

A patient presents with abnormally thickened jaw and hands after adulthood. Which condition is most likely?

Accepted Answer

Acromegaly

Question 13

Which bone marking is described as a prominent ridge found on the pelvis?

Accepted Answer

Crest

Question 14

Which of the following is a correct match between bone cell type and its main function?

Accepted Answer

Osteoclast: dissolves bone matrix

Question 15

Which mineral is most abundant in bone and essential for muscle contraction and nerve impulse generation?

Accepted Answer

Calcium

Question 16

Which process describes bone formation directly from mesenchymal cells without a prior cartilage model?

Accepted Answer

Intramembranous ossification

Question 17

A patient with Marfan syndrome is likely to have which of the following skeletal features?

Accepted Answer

Very tall stature with long, slender limbs

Question 18

Which of the following best explains why compact bone is strong along its length?

Accepted Answer

Osteons are organized in concentric lamellae around a central canal.

Question 19

Which step in endochondral ossification involves the formation of the primary ossification center?

Accepted Answer

Blood vessels penetrate cartilage and fibroblasts differentiate into osteoblasts.

Question 20

Which hormone decreases blood calcium levels by inhibiting osteoclast activity?

Accepted Answer

Calcitonin

Bones and Bone Structure: Structure, Function, and Growth

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