Question 1

Which of the following best describes the primary function of osteoclasts in bone tissue?

Accepted Answer

They break down bone matrix, releasing calcium into the blood.

Question 2

A patient presents with a fracture in the diaphysis of the femur. Which of the following best describes the diaphysis?

Accepted Answer

The shaft of a long bone composed primarily of compact bone.

Question 3

Which of the following equations correctly represents the process of bone mineralization?

Accepted Answer

$$Ca^{2+} + 2$$HPO_$$4^{2-} + OH$$^- \rightarrow Ca_{10}($$PO_4)_6(OH)_2$

Question 4

A 10-year-old child is experiencing rapid growth in height. Which structure in the long bone is primarily responsible for this growth?

Accepted Answer

Epiphyseal plate

Question 5

Which of the following best explains the difference between intramembranous and endochondral ossification?

Accepted Answer

Intramembranous ossification forms flat bones of the skull from mesenchyme, while endochondral ossification forms long bones from a cartilage model.

Question 6

A patient with osteoporosis is at increased risk for fractures due to decreased bone mass. Which hormone, when deficient, most directly contributes to this condition by reducing calcium deposition in bone?

Accepted Answer

Calcitonin

Question 7

Which of the following best describes the function of the periosteum?

Accepted Answer

It is a dense connective tissue membrane covering the outer surface of bones, providing a site for ligament and tendon attachment.

Question 8

A 25-year-old athlete experiences increased bone density in the dominant arm due to weight-bearing exercise. Which principle best explains this adaptation?

Accepted Answer

Wolff's Law: Bone grows and remodels in response to the mechanical stresses placed upon it.

Question 9

Which of the following is a correct sequence of events in bone fracture repair?

Accepted Answer

Hematoma formation, fibrocartilaginous callus formation, bony callus formation, bone remodeling

Question 10

Which of the following best describes the role of parathyroid hormone (PTH) in calcium homeostasis?

Accepted Answer

PTH increases blood calcium levels by stimulating osteoclast activity and increasing calcium reabsorption in the kidneys.

Question 11

A histological section of bone shows concentric rings of bone matrix surrounding a central canal. What is the name of this structural unit?

Accepted Answer

Osteon (Haversian system)

Question 12

Which of the following best describes the difference between compact bone and spongy bone?

Accepted Answer

Compact bone is composed of tightly packed osteons, while spongy bone consists of a network of trabeculae with spaces for marrow.

Question 13

A patient has a tumor that is destroying the articular cartilage of the knee. What is the most likely consequence?

Accepted Answer

Increased friction and pain during joint movement

Question 14

Which of the following best describes the function of canaliculi in bone tissue?

Accepted Answer

They connect lacunae, allowing osteocytes to exchange nutrients and waste.

Question 15

Which of the following is a correct description of the medullary cavity?

Accepted Answer

It is the cavity within the diaphysis of a long bone that contains yellow bone marrow in adults.

Question 16

A 60-year-old woman has decreased bone mass and increased risk of fractures. Which process is most likely impaired?

Accepted Answer

Bone deposition by osteoblasts

Question 17

Which of the following best describes the role of the epiphyseal line in adult bone?

Accepted Answer

It is a remnant of the epiphyseal plate, indicating where growth in length has ceased.

Question 18

Which of the following best explains why the femur is classified as a long bone?

Accepted Answer

It is longer than it is wide and has a shaft with two ends.

Question 19

Which of the following best describes the function of red bone marrow in adults?

Accepted Answer

It produces blood cells through hematopoiesis.

Question 20

A patient with a vitamin D deficiency is likely to have impaired bone mineralization. Which of the following best explains why?

Accepted Answer

Vitamin D is required for the absorption of calcium from the intestines, which is necessary for bone mineralization.

Bones, Bone Tissue, and Articulations: Study Notes for Anatomy & Physiology

Guida di studio - Domande di pratica

Study guide - Flashcard