Question 1

Which of the following best describes the primary difference between compact bone and spongy bone in terms of structure and function?

Accepted Answer

Compact bone is dense and provides strength for weight-bearing, while spongy bone contains trabeculae that support marrow and reduce bone weight.

Question 2

During bone growth, what is the main function of the epiphyseal plate?

Accepted Answer

It allows for longitudinal growth of bones by enabling new cartilage formation and subsequent ossification.

Question 3

Parathyroid hormone (PTH) regulates blood calcium levels by acting on bone tissue. Which of the following best describes its mechanism?

Accepted Answer

PTH stimulates osteoclasts to resorb bone, releasing calcium into the bloodstream.

Question 4

Which of the following lists correctly describes the steps of endochondral ossification?

Accepted Answer

Cartilage model formation, development of bone collar, invasion of blood vessels, formation of primary and secondary ossification centers.

Question 5

A patient presents with low blood calcium. Which hormone is most likely to be elevated, and what is its effect on bone?

Accepted Answer

Parathyroid hormone (PTH); increases bone resorption.

Question 6

What is the primary function of a bursa in a synovial joint?

Accepted Answer

To reduce friction between moving structures such as tendons and bones.

Question 7

Which of the following best explains how a bursa helps reduce friction in joints?

Accepted Answer

By providing a fluid-filled sac that cushions and separates moving tissues.

Question 8

In terms of movement, how does a hinge joint differ from a ball-and-socket joint? Provide an example of each.

Accepted Answer

Hinge joints allow flexion and extension in one plane; ball-and-socket joints allow movement in multiple planes, including rotation. Example: elbow (hinge), shoulder (ball-and-socket).

Question 9

Which of the following best describes the difference between a pivot joint and a saddle joint in terms of movement?

Accepted Answer

Pivot joints allow rotation around a single axis (e.g., atlantoaxial joint); saddle joints allow movement in two planes (e.g., thumb carpometacarpal joint).

Question 10

Which of the following best explains how tendons contribute to joint movement and stability?

Accepted Answer

Tendons connect muscles to bones, transmitting force for movement and stabilizing joints by maintaining alignment.

Question 11

A soccer player injures their shoulder during a game. Which type of joint is most likely affected, and what movements does this joint allow?

Accepted Answer

Ball-and-socket joint; allows flexion, extension, abduction, adduction, and rotation.

Question 12

Which movement describes moving a limb away from the midline of the body?

Accepted Answer

Abduction

Question 13

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

Accepted Answer

$$[Ca$$^{2+}$$]_{blood} \downarrow \Rightarrow PTH \uparrow \Rightarrow 	ext{bone resorption} \uparrow$$

Question 14

Which of the following is NOT a step in endochondral ossification?

Accepted Answer

Direct transformation of mesenchyme into bone without a cartilage stage

Question 15

A patient with osteoporosis is prescribed medication that inhibits osteoclast activity. What effect will this have on their bone tissue?

Accepted Answer

It will decrease bone resorption, helping to maintain or increase bone density.

Question 16

Which joint type allows the greatest range of motion, and what anatomical feature enables this?

Accepted Answer

Ball-and-socket joint; spherical head fitting into a cup-like socket.

Question 17

Which of the following best describes adduction in terms of joint movement?

Accepted Answer

Movement of a limb toward the midline.

Question 18

A gymnast performs a split, moving her legs apart sideways. Which joint movement is primarily involved?

Accepted Answer

Abduction

Question 19

Which of the following is a real-life example of a pivot joint?

Accepted Answer

Atlantoaxial joint between the first and second cervical vertebrae

Question 20

Which of the following best explains why the epiphyseal plate is critical during adolescence?

Accepted Answer

It is the site of longitudinal bone growth, enabling height increase.

Anatomy & Physiology: Bone Structure, Growth, and Joint Movement Study Notes

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