Q: Which equation best represents the negative feedback loop controlling blood calcium levels?

$Ca^{2+}_{blood} \downarrow \rightarrow \text{PTH secretion} \uparrow \rightarrow \text{Osteoclast activity} \uparrow \rightarrow Ca^{2+}_{blood} \uparrow$

Question 1

Which type of cartilage is most abundant in the human body and is found at articular surfaces of joints, costal cartilages, and the respiratory tract?

Accepted Answer

Hyaline cartilage

Question 2

A patient presents with a torn meniscus in the knee. Which type of cartilage is primarily affected?

Accepted Answer

Fibrocartilage

Question 3

Which layer surrounds cartilage, contains blood vessels for nutrient delivery, and helps resist outward expansion?

Accepted Answer

Perichondrium

Question 4

During bone development, which process describes the formation of bone by replacing hyaline cartilage?

Accepted Answer

Endochondral ossification

Question 5

Which bone cell type is responsible for bone resorption and is derived from hematopoietic stem cells?

Accepted Answer

Osteoclasts

Question 6

A child with vitamin D deficiency develops soft, weak bones. What is the name of this condition?

Accepted Answer

Rickets

Question 7

Which hormone stimulates osteoclast activity to increase blood calcium levels when they are low?

Accepted Answer

Parathyroid hormone (PTH)

Question 8

According to Wolff's law, how does bone adapt to mechanical stress?

Accepted Answer

Bones grow or remodel in response to the demands placed on them

Question 9

Which of the following is NOT a function of bone?

Accepted Answer

Protein synthesis

Question 10

During the repair of a bone fracture, which stage involves the formation of a soft callus composed of cartilage and collagen fibers?

Accepted Answer

Fibrocartilaginous callus formation

Question 11

Which equation best represents the negative feedback loop controlling blood calcium levels?

Accepted Answer

$Ca^{2+}_{blood} \downarrow ightarrow 	ext{PTH secretion} \uparrow ightarrow 	ext{Osteoclast activity} \uparrow ightarrow Ca^{2+}_{blood} \uparrow$

Question 12

Which process is responsible for the lengthwise growth of long bones during childhood and adolescence?

Accepted Answer

Interstitial growth at the epiphyseal plate

Question 13

A patient with scurvy is likely to have problems with bone growth due to a deficiency in which vitamin, and what is its role?

Accepted Answer

Vitamin C; necessary for collagen synthesis

Question 14

Which of the following best describes the role of osteocytes in bone tissue?

Accepted Answer

They maintain bone matrix and act as stress sensors

Question 15

Which of the following is a correct sequence of events in endochondral ossification?

Accepted Answer

Formation of bone collar, calcification of central cartilage, invasion by periosteal bud, formation of medullary cavity, secondary ossification

Question 16

Which zone of the epiphyseal plate is characterized by rapid cell division, pushing the epiphysis away from the diaphysis?

Accepted Answer

Proliferation (growth) zone

Question 17

A weightlifter develops thickened bone projections at muscle attachment sites. Which principle explains this adaptation?

Accepted Answer

Wolff's law

Question 18

Which of the following is a correct formula for the mineral part of bone matrix?

Accepted Answer

$Ca_{10}(PO_4)_6(OH)_2$

Question 19

Which bone cell type is mitotically active and can differentiate into osteoblasts or bone-lining cells?

Accepted Answer

Osteogenic cells

Question 20

A fracture in which the bone ends are out of normal alignment and the skin is penetrated is classified as:

Accepted Answer

Displaced, open (compound)

Bones and Skeletal Tissues: Structure, Types, and Functions Presentationn

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