Q: Which of the following equations correctly represents the process of vitamin D activation in the skin upon exposure to UV light?

$$ 7\text{-dehydrocholesterol} \xrightarrow{UV\ light} \text{cholecalciferol (vitamin D}_3\text{)} $$

Q: Which equation best represents the relationship between calcium homeostasis and parathyroid hormone (PTH)?

$$ \text{Low blood Ca}^{2+} \rightarrow \text{PTH release} \rightarrow \text{bone resorption} \rightarrow \text{increased blood Ca}^{2+} $$

Question 1

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

Accepted Answer

Osteoclasts are responsible for bone resorption, breaking down bone tissue to release calcium.

Question 2

A patient presents with a fracture that is healing through the following steps: hematoma formation, fibrocartilaginous callus formation, bony callus formation, and bone remodeling. Which process is being described?

Accepted Answer

Fracture repair

Question 3

Which type of connective tissue fiber provides the greatest tensile strength to the matrix?

Accepted Answer

Collagen fibers

Question 4

Which layer of the skin contains the majority of accessory structures such as glands, hair follicles, and blood vessels?

Accepted Answer

Dermis

Question 5

A long bone consists of several regions. Which region is responsible for longitudinal growth during childhood and adolescence?

Accepted Answer

Epiphyseal plate

Question 6

Which of the following equations correctly represents the process of vitamin D activation in the skin upon exposure to UV light?

Accepted Answer

$$ 7	ext{-dehydrocholesterol} \xrightarrow{UV\ light} 	ext{cholecalciferol (vitamin D}_3	ext{)} $$

Question 7

Which of the following is a function of the periosteum?

Accepted Answer

It covers the outer surface of bone, provides attachment for tendons and ligaments, and contains osteogenic cells.

Question 8

A patient with osteoporosis is experiencing increased bone degradation. Which hormone is most likely elevated, contributing to this process?

Accepted Answer

Parathyroid hormone (PTH)

Question 9

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

Accepted Answer

Compact bone is dense and organized into osteons, while spongy bone is porous and contains trabeculae.

Question 10

Which of the following is NOT a function of the skin?

Accepted Answer

Production of red blood cells

Question 11

Which equation best represents the relationship between calcium homeostasis and parathyroid hormone (PTH)?

Accepted Answer

$$ 	ext{Low blood Ca}^{2+} ightarrow 	ext{PTH release} ightarrow 	ext{bone resorption} ightarrow 	ext{increased blood Ca}^{2+} $$

Question 12

Which of the following best explains the process of endochondral ossification?

Accepted Answer

Bone replaces a pre-existing hyaline cartilage model, forming most bones below the skull.

Question 13

A patient has a deficiency in vitamin D. Which of the following is a likely consequence?

Accepted Answer

Decreased absorption of calcium in the intestines, leading to weakened bones.

Question 14

Which of the following is the correct order of layers in the epidermis from deepest to most superficial?

Accepted Answer

Stratum basale, stratum spinosum, stratum granulosum, stratum corneum

Question 15

Which of the following statements about fascia is correct?

Accepted Answer

Fascia is a connective tissue that surrounds muscles, groups of muscles, blood vessels, and nerves.

Question 16

Which of the following is a function of the endosteum?

Accepted Answer

It lines the inner surface of the medullary cavity and contains osteogenic cells for bone growth and repair.

Question 17

Which of the following best describes the role of melanocytes in the skin?

Accepted Answer

Melanocytes produce melanin, which protects against UV radiation and determines skin color.

Question 18

A patient presents with excessive curvature of the thoracic spine. Which condition is most likely present?

Accepted Answer

Kyphosis

Question 19

Which of the following is the correct formula for calculating bone mineral density (BMD) using dual-energy X-ray absorptiometry (DXA)?

Accepted Answer

$$ 	ext{BMD} = \frac{	ext{Bone mineral content (g)}}{	ext{Area (cm}^2	ext{)}} $$

Anatomy & Physiology Exam 2 Study Guide: Tissues, Integument, Bone Development, and Skeletal System

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