Q: Which of the following equations correctly represents the mechanical advantage (MA) of a lever, and what does an MA less than 1 indicate in a human limb?

$$MA = \frac{\text{length of effort arm}}{\text{length of resistance arm}}$$; MA \u003c 1 means the limb produces more speed and distance than force.

Question 1

Which of the following best describes a synchondrosis joint, and which real-life example fits this category?

Accepted Answer

A joint where two bones are joined by hyaline cartilage; for example, the epiphyseal plate in a growing long bone.

Question 2

A patient presents with pain and swelling in the knee after a twisting injury. MRI reveals a tear in the anterior cruciate ligament (ACL). What is the primary function of the ACL in the knee joint?

Accepted Answer

To prevent hyperextension of the knee.

Question 3

Which of the following equations correctly represents the mechanical advantage (MA) of a lever, and what does an MA less than 1 indicate in a human limb?

Accepted Answer

$$MA = \frac{	ext{length of effort arm}}{	ext{length of resistance arm}}$$; MA \u003c 1 means the limb produces more speed and distance than force.

Question 4

Which type of synovial joint allows for the greatest range of motion and is found in the shoulder and hip?

Accepted Answer

Ball-and-socket joint

Question 5

A dentist is explaining to a patient that the attachment of a tooth to its socket is a unique type of joint. What is the name of this joint, and what tissue primarily holds it in place?

Accepted Answer

Gomphosis; held by the periodontal ligament

Question 6

Which movement describes raising your arm laterally away from your body in the frontal plane, and what is the opposite movement called?

Accepted Answer

Abduction; the opposite is adduction

Question 7

Which of the following is a real-life example of a first-class lever in the human body?

Accepted Answer

Atlanto-occipital joint when nodding the head

Question 8

Which structure in a synovial joint is responsible for secreting synovial fluid and removing debris?

Accepted Answer

Synovial membrane

Question 9

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

Accepted Answer

Autoimmune attack on the synovial membrane

Question 10

Which of the following best explains why exercise is beneficial for articular cartilage in synovial joints?

Accepted Answer

Exercise increases synovial fluid absorption by cartilage, improving nutrient and waste exchange.

Question 11

Which of the following is NOT a characteristic of a synovial joint?

Accepted Answer

Bones joined by fibrocartilage only

Question 12

A person is able to rotate their forearm so that the palm faces upward. What is this movement called, and which bones are involved?

Accepted Answer

Supination; radius and ulna

Question 13

Which of the following joints is classified as a symphysis, and what type of cartilage is found there?

Accepted Answer

Pubic symphysis; fibrocartilage

Question 14

Which of the following best describes the function of the meniscus in the knee joint?

Accepted Answer

Absorbs shock, stabilizes the joint, and improves fit between bones

Question 15

A person is standing and tilts their head to the right, away from the midline. What is this movement called?

Accepted Answer

Lateral flexion

Question 16

Which ligament in the shoulder joint is most likely to be damaged during an anterior dislocation of the humerus?

Accepted Answer

Glenohumeral ligament

Question 17

Which of the following is a distinguishing feature of a pivot joint, and where is one found in the human body?

Accepted Answer

Allows rotation on a longitudinal axis; found at the atlantoaxial joint

Question 18

Which of the following best describes the difference between a syndesmosis and a suture?

Accepted Answer

A syndesmosis is more mobile due to longer collagen fibers, while a suture is immobile with short collagen fibers.

Question 19

Which of the following movements is unique to the thumb and allows humans to grasp objects?

Accepted Answer

Opposition

Question 20

A patient is diagnosed with osteoarthritis. Which of the following best describes the pathological process in this condition?

Accepted Answer

Degeneration of articular cartilage and formation of bone spurs

Joints: Structure, Classification, and Function in Human Anatomy & Physiology Ch 9

Study Guide - Practice Questions

Study Guide - Flashcards