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Chapter 38: Q. 18 (page 1120)

The elbow is an example of which type of joint?

  1. hinge
  2. pivot
  3. saddle
  4. gliding

Short Answer

Expert verified

The correct answer is option (a).

The elbow is an example of hinge joint.

Step by step solution

01

Hinge joint

  • The hinge joint is formed of hyaline cartilage, which is lubricated by synovial fluid, which connects two or more bones.
  • In order for hinge joints to work, one plane must be able to bend and extend, and another plane must only move very slightly.
  • A crucial part of the intricate biomechanics of the human body is the hinge joint.
02

Step: 1 Explanation for Correct answer

  • Three bones, the humerus, ulna, and radius, form the elbow's hinge joint.
  • Elbow movement only occurs in one plane because it is a hinge joint.
  • Forearm movement at the elbow joint is a part of elbow joint movements. Thus, the option a is correct.
03

Step: 2 Explanation for incorrect answer

  • The neck's first and second vertebral joints, which permit back-and-forth movement of the head, are an example of a pivot joint. So, option b is wrong.
  • Thumb joints are a good example of saddle joints. So, option c is wrong as well.
  • The wrist joint is an example of a gliding joint. Hence, option d is wrong too.

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The elbow is an example of which type of joint?

a. hinge

b. pivot

c. saddle

d. gliding

Which of the following statements about muscle contraction is true?

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