Q: Which of the following equations best represents the mechanical advantage (MA) of a lever in the human body?

$$MA = \frac{\text{effort arm}}{\text{resistance arm}}$$

Question 1

Which type of joint is characterized by the fusion of two bones, resulting in an immovable connection, and is exemplified by the fusion of the frontal bones in infants?

Accepted Answer

Bony joint (synostosis)

Question 2

A dentist is examining the attachment of a tooth to its socket. Which type of joint is being observed, and what is its primary structural feature?

Accepted Answer

Gomphosis; held in place by a fibrous periodontal ligament

Question 3

Which of the following best describes a syndesmosis joint?

Accepted Answer

Bones are connected by a ligament and are slightly movable

Question 4

The pubic symphysis and intervertebral discs are examples of which type of joint, and what is the main tissue involved?

Accepted Answer

Symphysis; fibrocartilage

Question 5

Which of the following statements about synovial joints is TRUE?

Accepted Answer

They are separated by a joint cavity filled with synovial fluid

Question 6

A baseball pitcher winds up for a pitch, moving his arm in a circular motion while the shoulder remains stationary. What is the name of this movement, and which sequence of actions does it involve?

Accepted Answer

Circumduction; flexion, abduction, extension, and adduction

Question 7

Which type of synovial joint allows movement in three planes and is found in the shoulder and hip?

Accepted Answer

Ball-and-socket joint

Question 8

A patient presents with pain and crackling sounds in the knee after years of running. Imaging shows degeneration of articular cartilage and bone spurs. What is the most likely diagnosis?

Accepted Answer

Osteoarthritis

Question 9

Which of the following correctly matches the lever class with its anatomical example?

Accepted Answer

Second-class lever: standing on tiptoe

Question 10

Which factor does NOT directly increase the range of motion (ROM) of a synovial joint?

Accepted Answer

Fusion of bones at the joint

Question 11

What is the primary function of synovial fluid within a joint cavity?

Accepted Answer

To provide shock absorption and lubrication

Question 12

Which movement describes raising the medial edge of the foot?

Accepted Answer

Inversion

Question 13

A person shrugs their shoulders, raising the clavicles. What is this movement called?

Accepted Answer

Elevation

Question 14

Which joint type is found at the base of the thumb and allows biaxial movement?

Accepted Answer

Saddle joint

Question 15

Which ligament is responsible for preventing excessive rotation of the extended knee?

Accepted Answer

Medial and lateral collateral ligaments

Question 16

During a physical exam, a patient is asked to rotate their forearm so the palm faces forward. What is this movement called?

Accepted Answer

Supination

Question 17

Which of the following equations best represents the mechanical advantage (MA) of a lever in the human body?

Accepted Answer

$$MA = \frac{	ext{effort arm}}{	ext{resistance arm}}$$

Question 18

Which joint is the most freely movable in the human body and is stabilized by the rotator cuff muscles?

Accepted Answer

Humeroscapular (shoulder) joint

Question 19

A patient with rheumatoid arthritis is experiencing joint pain and swelling. What is the underlying cause of this condition?

Accepted Answer

Autoimmune attack on the synovial membrane

Question 20

Which of the following movements involves decreasing the angle of a joint?

Accepted Answer

Flexion

Chapter 9: Joints (Articulations) – Structure and Function

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