Q: Which equation best represents the negative feedback loop for calcium homeostasis in bone?

$$Ca^{2+}$$_{blood} \xrightarrow{\text{decrease}} \text{Parathyroid hormone release} \xrightarrow{\text{increase}} \text{Osteoclast activity} \xrightarrow{\text{increase}} $$Ca^{2+}$$_{blood}$$

Question 1

Which of the following best describes the function of ligaments in the skeletal system?

Accepted Answer

They hold bones together at joints (articulations).

Question 2

A patient presents with a herniated intervertebral disc. Which type of cartilage is primarily affected in this condition?

Accepted Answer

Fibrocartilage

Question 3

Which bone marking is most likely to serve as a passageway for nerves and blood vessels?

Accepted Answer

Foramen

Question 4

How does the adult skull differ from the fetal skull?

Accepted Answer

The fetal skull has unfused sutures and fontanels to allow for growth and birth.

Question 5

Which of the following is NOT a component of bone tissue?

Accepted Answer

Muscle tissue

Question 6

A fracture that breaks the skin and damages surrounding tissues is classified as:

Accepted Answer

Compound fracture

Question 7

Which equation best represents the negative feedback loop for calcium homeostasis in bone?

Accepted Answer

$$Ca^{2+}$$_{blood} \xrightarrow{	ext{decrease}} 	ext{Parathyroid hormone release} \xrightarrow{	ext{increase}} 	ext{Osteoclast activity} \xrightarrow{	ext{increase}} $$Ca^{2+}$$_{blood}$$

Question 8

Which of the following bones is classified as a sesamoid bone?

Accepted Answer

Patella

Question 9

A patient with exaggerated thoracic curvature of the spine is diagnosed with:

Accepted Answer

Kyphosis

Question 10

Which of the following is a projection that serves as a site for ligament or tendon attachment?

Accepted Answer

Crest

Question 11

Which type of cartilage is found in the epiglottis and provides high elasticity?

Accepted Answer

Elastic cartilage

Question 12

How many bones are typically found in the adult vertebral column?

Accepted Answer

33

Question 13

Which of the following is true regarding the thoracic cage?

Accepted Answer

It consists of 25 bones including the sternum and ribs.

Question 14

Which bone is NOT part of the axial skeleton?

Accepted Answer

Femur

Question 15

Which of the following best describes the role of osteoclasts in bone remodeling?

Accepted Answer

They resorb bone by secreting hydrogen ions and enzymes.

Question 16

A patient with abnormal lateral curvature of the vertebral column is most likely suffering from:

Accepted Answer

Scoliosis

Question 17

Which of the following equations correctly represents the number of bones in the adult appendicular skeleton?

Accepted Answer

$$4 + 60 + 2 + 60 = 126$$

Question 18

Which bone marking is a depression that allows passage for blood vessels and nerves?

Accepted Answer

Groove

Question 19

Which of the following is a real-life consequence of sedentary lifestyle on bone health?

Accepted Answer

Increased bone resorption and decreased bone density.

Question 20

Which of the following is true about the function of the nucleus pulposus in intervertebral discs?

Accepted Answer

It acts as a resilient shock absorber between vertebrae.

Chapter 7: The Skeletal System – Structure, Components, and Functions

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