Question 1

Which of the following best describes the initial step in intramembranous ossification?

Accepted Answer

Mesenchymal cells differentiate into osteoprogenitor cells within thickened regions of mesenchyme.

Question 2

During endochondral ossification, what is the primary function of the periosteal bud?

Accepted Answer

To bring osteoprogenitor cells and blood vessels into the degenerating cartilage.

Question 3

Which hormone is primarily responsible for increasing blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 4

A child with a calcium deficiency is most likely to develop which condition?

Accepted Answer

Rickets

Question 5

Which of the following equations best represents the process of bone matrix calcification?

Accepted Answer

$$Ca^{2+}$$ + $$PO_4$$^{3-} \rightarrow $$Ca_3$$($$PO_4)_2$

Question 6

Which type of cartilage is found in the intervertebral discs and is characterized by abundant type I collagen fibers?

Accepted Answer

Fibrocartilage

Question 7

What is the main function of the epiphyseal plate during bone growth?

Accepted Answer

To allow for longitudinal growth of long bones.

Question 8

Which of the following best describes the role of osteoblasts during bone repair?

Accepted Answer

They synthesize new bone matrix to form the hard callus.

Question 9

Which of the following is true regarding the structure of hyaline cartilage?

Accepted Answer

It has a homogeneous, glassy matrix with type II collagen.

Question 10

A patient with a pituitary tumor producing excess growth hormone after epiphyseal plate closure is likely to develop which condition?

Accepted Answer

Acromegaly

Question 11

Which of the following best explains why fibrocartilage is well-suited for weight-bearing structures?

Accepted Answer

It has bundles of type I collagen for tensile strength.

Question 12

Which process is responsible for the thickening of bones during growth?

Accepted Answer

Appositional growth

Question 13

Which of the following is a distinguishing feature of elastic cartilage compared to hyaline cartilage?

Accepted Answer

Presence of numerous branching elastic fibers

Question 14

During bone remodeling, which cells are primarily responsible for bone resorption?

Accepted Answer

Osteoclasts

Question 15

Which of the following best describes the sequence of events in bone fracture repair?

Accepted Answer

Hematoma formation → soft callus formation → hard callus formation → bone remodeling

Question 16

Which of the following equations represents the relationship between bone mass and mechanical stress, as described by Wolff's Law?

Accepted Answer

$$\Delta M = k \cdot S$$

Question 17

Which hormone accelerates the closure of epiphyseal plates during puberty?

Accepted Answer

Sex hormones (estrogens and androgens)

Question 18

Which of the following best describes the arrangement of chondrocytes in fibrocartilage?

Accepted Answer

Arranged in alternating parallel rows between collagen bundles

Question 19

Which of the following is NOT a function of hyaline cartilage?

Accepted Answer

Weight bearing in intervertebral discs

Question 20

A patient presents with delayed bone healing after a fracture. Which nutritional deficiency is most likely contributing to this problem?

Accepted Answer

Calcium deficiency

Bone formation and cartilage.pptx

Guida di studio - Domande di pratica