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Skeletal Tissues Ultimate Exam
Question 1. Which layer of cartilage contains blood vessels and nerves? A) Perichondrium B) Calcified cartilage C) Articular cartilage D) Hyaline matrix Answer: A Explanation: The perichondrium is a dense connective tissue layer surrounding cartilage that supplies it with blood vessels and nerves. Question 2. Growth of cartilage that occurs from the outer surface is called: A) Interstitial growth B) Appositional growth C) Endochondral ossification D) Intramembranous ossification Answer: B Explanation: Appositional growth adds new cartilage layers to the periphery, increasing thickness. Question 3. Which type of cartilage is the primary component of the embryonic skeleton? A) Fibrocartilage B) Elastic cartilage C) Hyaline cartilage D) Calcified cartilage Answer: C Explanation: Hyaline cartilage forms the model for most bones during embryonic development. Question 4. Elastic cartilage is found in which of the following structures? A) Articular surfaces of joints
Skeletal Tissues Ultimate Exam
B) Intervertebral discs C) External ear (pinna) D) Menisci of the knee Answer: C Explanation: The external ear and epiglottis contain elastic cartilage, giving them flexibility. Question 5. Fibrocartilage is best suited for which function? A) Providing a smooth, low-friction surface for joint movement B) Supplying structural flexibility in the ear C) Absorbing shock and resisting tensile forces D) Serving as a template for bone formation Answer: C Explanation: Fibrocartilage’s dense collagen fibers make it ideal for shock absorption in menisci and intervertebral discs. Question 6. The primary role of the skeletal system in protecting internal organs includes: A) Producing red blood cells B) Acting as levers for muscle attachment C) Forming a rigid cage around the brain and thorax D) Storing triglycerides Answer: C Explanation: Bones such as the skull and rib cage encase vital organs, providing protection. Question 7. Which bone type is defined by a length that greatly exceeds its width? A) Short bone B) Flat bone
Skeletal Tissues Ultimate Exam
Explanation: Yellow marrow fills the medullary cavity of long bones and stores fat as triglycerides. Question 11. Osteocalcin, a hormone produced by osteoblasts, primarily influences: A) Calcium absorption in the gut B) Insulin secretion and glucose metabolism C. Parathyroid hormone release D. Erythropoiesis Answer: B Explanation: Osteocalcin enhances insulin secretion and improves glucose handling, linking bone to energy metabolism. Question 12. The region of a long bone where new bone is produced during growth is the: A) Diaphysis B) Epiphysis C) Metaphysis D) Epiphyseal plate Answer: D Explanation: The epiphyseal (growth) plate is cartilage that proliferates and later ossifies, lengthening the bone. Question 13. In compact bone, the functional unit is the: A) Trabecula B) Osteon (Haversian system) C) Lacuna D) Canaliculus Answer: B Explanation: Osteons consist of concentric lamellae surrounding a central canal, forming the basic structural unit of compact bone.
Skeletal Tissues Ultimate Exam
Question 14. Which canal carries blood vessels and nerves that run longitudinally through compact bone? A) Volkmann’s canal B) Haversian canal C) Canaliculus D) Nutrient canal Answer: B Explanation: Haversian (central) canals run parallel to the long axis of the bone and contain vessels and nerves. Question 15. Perforating canals (Volkmann’s canals) serve to: A) Connect Haversian canals with the periosteum B) Transport osteoblasts to the bone surface C) Link Haversian canals with each other and with the periosteum and endosteum D) Provide a pathway for red blood cells only Answer: C Explanation: Volkmann’s canals run transversely, linking Haversian systems and allowing communication between the periosteum, endosteum, and marrow. Question 16. The microscopic channels that allow osteocytes to exchange nutrients with each other are called: A) Central canals B) Canaliculi C) Periosteal fibers D) Endosteal tunnels Answer: B Explanation: Canaliculi are tiny extensions of the lacunae that connect osteocytes to the central canal and each other.
Skeletal Tissues Ultimate Exam
A) Collagen B) Hydroxyapatite (calcium phosphate) C) Elastin D) Glycosaminoglycans Answer: B Explanation: Hydroxyapatite crystals deposit within the matrix, making bone rigid and compression-resistant. Question 21. Which of the following best describes interstitial growth of cartilage? A) Growth at the periphery by addition of chondroblasts B) Expansion of cartilage from within by chondrocyte division C) Replacement of cartilage by bone in endochondral ossification D) Degeneration of cartilage during aging Answer: B Explanation: Interstitial growth occurs when chondrocytes divide and secrete matrix inside the cartilage, increasing its size. Question 22. The perichondrium is absent from which type of cartilage? A) Hyaline cartilage covering articular surfaces B) Elastic cartilage of the ear C) Fibrocartilage of intervertebral discs D) All cartilage types possess a perichondrium Answer: A Explanation: Articular hyaline cartilage is avascular and lacks a perichondrium; nutrients diffuse from synovial fluid. Question 23. Which bone is primarily composed of spongy bone surrounded by a thin layer of compact bone? A) Femur diaphysis
Skeletal Tissues Ultimate Exam
B) Vertebral body C) Humerus shaft D) Metatarsal head Answer: B Explanation: Vertebral bodies have a thick trabecular (spongy) interior encased by a thin compact shell. Question 24. The primary function of the epiphysis in a long bone is to: A) House the nutrient foramen B) Provide attachment for muscles C) Contain spongy bone and support joint articulation D) Produce blood cells only Answer: C Explanation: Epiphyses are filled with spongy bone, covered by articular cartilage, and form joint surfaces. Question 25. Hematopoiesis in adults occurs mainly in: A) Compact bone of the diaphysis B) Yellow marrow of the medullary cavity C) Red marrow of flat and irregular bones D) Periosteum Answer: C Explanation: Red marrow, found in flat bones (sternum, pelvis) and epiphyses of long bones, is the site of blood cell formation. Question 26. Which of the following statements about osteogenic cells is correct? A) They are mature osteocytes embedded in lacunae B) They are multinucleated bone-resorbing cells
Skeletal Tissues Ultimate Exam
D) Auricle of the ear Answer: C Explanation: The knee meniscus experiences shear and compressive forces; fibrocartilage’s dense collagen resists these stresses. Question 30. The primary mineral stored in bone that can be mobilized to maintain serum calcium levels is: A) Sodium chloride B) Calcium phosphate (hydroxyapatite) C) Magnesium sulfate D) Potassium phosphate Answer: B Explanation: Hydroxyapatite crystals release calcium and phosphate when needed to regulate blood levels. Question 31. Which bone is an example of an irregular bone? A) Scapula B) Patella C) Vertebra D) Carpals Answer: C Explanation: Vertebrae have complex shapes with protruding processes, classifying them as irregular bones. Question 32. The main function of the periosteum’s inner (osteogenic) layer is to: A) Supply nerves to the bone surface B) Produce osteoblasts for bone growth and repair C) Store fat in the form of yellow marrow D) Protect against infection
Skeletal Tissues Ultimate Exam
Answer: B Explanation: The inner cambium layer of periosteum contains osteogenic cells that become osteoblasts. Question 33. Which of the following best describes the relationship between osteoblasts and osteocytes? A) Osteoblasts become osteocytes after they become trapped in matrix they secrete B) Osteocytes differentiate into osteoblasts during remodeling C) Osteoblasts destroy osteocytes during resorption D) Osteocytes and osteoblasts are unrelated cell lines Answer: A Explanation: Osteoblasts secrete osteoid; once embedded, they mature into osteocytes. Question 34. During endochondral ossification, the cartilage model is first replaced by bone at which region? A) Diaphysis only B) Epiphysis only C) Both diaphysis and epiphysis simultaneously D) Primary ossification center in the diaphysis Answer: D Explanation: The primary ossification center forms in the diaphysis, where cartilage is first replaced by bone. Question 35. Which of the following is NOT a function of the skeletal system? A) Production of erythrocytes B) Regulation of body temperature C) Storage of calcium phosphate D) Providing levers for muscle action Answer: B
Skeletal Tissues Ultimate Exam
Question 39. Which of the following statements about hyaline cartilage is true? A) It contains abundant elastic fibers B) It is the main component of the intervertebral disc nucleus pulposus C) It provides a smooth, low-friction surface at synovial joints D) It is highly vascularized throughout its matrix Answer: C Explanation: Hyaline cartilage covers joint surfaces, allowing smooth movement. Question 40. The process by which bone tissue is broken down and its minerals released into the bloodstream is called: A) Osteogenesis B) Osteolysis C) Calcification D) Mineralization Answer: B Explanation: Osteolysis (bone resorption) is performed by osteocells to release calcium and phosphate. Question 41. Which structure connects the epiphysis to the diaphysis in a mature long bone? A) Metaphysis (containing the epiphyseal line) B) Periosteum C) Endosteum D) Articular cartilage Answer: A Explanation: The metaphysis includes the former growth plate, now the epiphyseal line, linking epiphysis and diaphysis. Question 42. The primary organic component that gives bone its flexibility is:
Skeletal Tissues Ultimate Exam
A) Hydroxyapatite crystals B) Type I collagen fibers C) Elastin fibers D) Glycoprotein matrix Answer: B Explanation: Type I collagen provides tensile strength and flexibility to the bone matrix. Question 43. Which bone is primarily a site of intramembranous ossification? A) Femur B) Scapula C) Clavicle D. Vertebrae Answer: C Explanation: The clavicle is the first bone to ossify via intramembranous ossification, directly from mesenchyme. Question 44. The canal that runs perpendicular to the long axis of the bone and connects Haversian systems is the: A) Central canal B) Canaliculus C) Volkmann’s canal D) Nutrient canal Answer: C Explanation: Volkmann’s (perforating) canals run transverse, linking Haversian canals. Question 45. Which of the following best explains why spongy bone is lighter than compact bone? A) It contains more hydroxyapatite
Skeletal Tissues Ultimate Exam
Answer: B Explanation: Lamellae are concentric layers of mineralized matrix surrounding the Haversian canal. Question 49. Which of the following best characterizes the periosteum? A) A dense, avascular membrane covering bone surfaces B) A vascularized membrane that contains osteogenic cells and sensory nerves C) A thin layer of cartilage covering joint surfaces D) A membrane that lines the medullary cavity only Answer: B Explanation: The periosteum is a vascular, innervated connective tissue sheath with an outer fibrous layer and inner osteogenic layer. Question 50. The primary mineral component of bone is a crystalline form of: A) Calcium carbonate B) Calcium phosphate (hydroxyapatite) C) Sodium chloride D) Magnesium hydroxide Answer: B Explanation: Hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂) is the main inorganic constituent providing hardness. Question 51. Which cartilage type is found in the auditory (Eustachian) tube? A) Hyaline cartilage B) Elastic cartilage C) Fibrocartilage D) Calcified cartilage Answer: A Explanation: The auditory tube is supported by hyaline cartilage, offering rigidity while remaining flexible.
Skeletal Tissues Ultimate Exam
Question 52. The process of bone formation from pre-existing bone tissue is called: A) Intramembranous ossification B) Endochondral ossification C) Appositional growth D) Interstitial growth Answer: C Explanation: Appositional (or secondary) ossification adds new layers to the bone surface, increasing diameter. Question 53. Which of the following best describes the function of canaliculi? A) Carry blood vessels into the bone matrix B) Provide a pathway for nutrients and waste between osteocytes and the central canal C) Serve as sites for osteoclast attachment D) Form the outer surface of the periosteum Answer: B Explanation: Canaliculi are microscopic channels that link osteocytes to each other and to the Haversian canal for nutrient exchange. Question 54. The presence of a growth plate indicates that a bone is: A) Fully mature and fused B) Still undergoing longitudinal growth C) Composed primarily of fibrocartilage D) A sesamoid bone Answer: B Explanation: Growth plates (epiphyseal plates) are cartilage regions where longitudinal growth occurs in children and adolescents.
Skeletal Tissues Ultimate Exam
A) Long bone B) Flat bone C) Irregular bone D) Sesamoid bone Answer: B Explanation: Flat bones have this configuration and include many cranial bones. Question 59. The primary source of nutrients for cartilage is: A) Direct blood vessels within the matrix B) Diffusion from the perichondrium and synovial fluid C) Lymphatic vessels within the cartilage D) Osteocytes Answer: B Explanation: Cartilage is avascular; nutrients diffuse from surrounding perichondrium or synovial fluid. Question 60. Which of the following best explains why bones can act as levers? A) Their elasticity allows them to bend like springs B) Their rigid shape provides a fixed axis around which muscles can exert force C) Their ability to store triglycerides provides energy for movement D) Their production of osteocalcin regulates muscle contraction Answer: B Explanation: Bones’ rigidity creates stable levers that muscles pull on to generate movement. Question 61. The main difference between hyaline and fibrocartilage is: A) Hyaline contains elastic fibers, fibrocartilage does not B) Fibrocartilage contains dense collagen bundles, hyaline has a uniform matrix C) Hyaline is found only in the ear, fibrocartilage only in joints
Skeletal Tissues Ultimate Exam
D) Fibrocartilage is vascular, hyaline is avascular Answer: B Explanation: Fibrocartilage’s dense collagen fibers give it high tensile strength; hyaline cartilage has a smooth, homogenous matrix. Question 62. Which of the following bones develops by intramembranous ossification? A) Femur B) Temporal bone (part of skull) C) Tibia D) Vertebrae Answer: B Explanation: Many flat skull bones, including parts of the temporal bone, form directly from mesenchyme via intramembranous ossification. Question 63. The term “osteoid” refers to: A) The mineral component of bone B) The unmineralized organic matrix secreted by osteoblasts C) The vascular network within bone D) The marrow cavity filled with fat Answer: B Explanation: Osteoid is the collagen-rich organic matrix that later becomes mineralized. Question 64. Which of the following best describes the function of the periosteal nerves? A) They regulate calcium release from bone B) They provide sensation and pain perception from the bone surface C) They stimulate osteoclast activity directly D) They transport red blood cells into the marrow
