Тест: Fundamentals of Bone Structure and Growth — 9 въпроса

1. What does the skeletal system primarily consist of?

A. Skin and connective tissue

B. Nerves and blood vessels

C. Muscles and tendons

D. Bones and cartilage

Answer: (D)

Обяснение

The skeletal system is primarily composed of bones and cartilage, providing support, protection, and structure to the body, as explicitly stated in the course outline.

2. What is the primary function of osteocytes within bone tissue?

A. They produce new bone cells during growth.

B. They maintain the bone tissue by regulating mineral content.

C. They are involved in bone resorption during remodeling.

D. They serve as the main cells responsible for bone marrow formation.

Answer: (B)

Обяснение

Osteocytes are mature bone cells that help maintain bone tissue and regulate mineral content, essential for bone health and stability.

3. What is the main role of the different types of bones in the skeletal system?

A. To produce blood cells and store minerals

B. To support muscles and facilitate movement

C. To generate energy and regulate body temperature

D. To provide support, protection, and facilitate movement

Answer: (D)

Обяснение

The primary function of bones, regardless of their type, is to provide support for the body, protect vital organs, and facilitate movement by serving as attachment points for muscles. While bones also produce blood cells and store minerals, these are secondary functions, not the main purpose of their structure.

4. According to the revision sheet, approximately how many bones are in the adult human skeleton?

A. 150 bones

B. 206 bones

C. 300 bones

D. 100 bones

Answer: (B)

Обяснение

The adult human skeleton typically consists of about 206 bones, which form the structural framework of the body.

5. How do osteocytes and osteoblasts differ in their roles within bone tissue?

A. Osteocytes maintain bone tissue, whereas osteoblasts are responsible for forming new bone.

B. Osteocytes are responsible for resorbing bone tissue, while osteoblasts maintain bone matrix.

C. Osteocytes and osteoblasts both have the same function of maintaining bone tissue.

D. Osteocytes produce bone matrix, while osteoblasts are involved in bone resorption.

Answer: (A)

Обяснение

Osteocytes are mature bone cells that maintain the bone tissue, while osteoblasts are cells that synthesize and deposit new bone matrix during formation and repair.

6. During embryogenesis, the development of the skeletal system occurs in which sequence?

A. From cartilage to bone, then to notochord development.

B. From notochord to cartilage, then ossification into bone.

C. From bone to cartilage, then to marrow formation.

D. From muscle tissue to cartilage, then to bone.

Answer: (B)

Обяснение

The development begins with the notochord forming, followed by cartilage formation, and finally ossification into bone.

7. What percentage of the bone’s matrix is composed of mineral salts such as calcium and phosphate, according to the sheet?

A. Approximately 20%

B. Approximately 65%

C. Approximately 50%

D. Approximately 80%

Answer: (B)

Обяснение

Mineral salts make up about 65% of the bone's matrix, contributing to its hardness and strength.

8. Which part of bone tissue is responsible for forming concentric lamellae around Haversian canals?

A. Osteocytes

B. Osteoblasts

C. Lacunae

D. Bone matrix forming concentric lamellae

Answer: (D)

Обяснение

The bone matrix forms the concentric lamellae around Haversian canals, which are a key feature of compact bone structure.

9. What is the main difference between compact and spongy bone tissue?

A. Compact bone is dense and solid, spongy bone is porous and trabecular.

B. Compact bone contains red marrow, spongy bone contains yellow marrow.

C. Spongy bone is only found in long bones, compact in flat bones.

D. Compact bone has no Haversian canals, spongy bone does.

Answer: (A)

Обяснение

Compact bone is dense with a solid structure, while spongy bone has a porous, trabecular structure that contains marrow.