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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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Most popular questions from this chapter

The epiphyseal plate:

  1. is arranged as rods or plates
  2. contains the bone’s blood vessels and nerve fibers
  3. is responsible for the lengthwise growth of long bones
  4. synthesizes and secretes bone matrix

The muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous stimulation is still present in the synapse. The activity of ________ helps to remove this neurotransmitter.

  1. myosin
  2. action potential
  3. tropomyosin
  4. acetylcholinesterase

The cell membrane of a muscle fiber is called a ________.

a. myofibril

b. sarcolemma

c. sarcoplasm

d. myofilament

The movement of bone away from the midline of the body is called ________.

  1. circumduction
  2. extension
  3. adduction
  4. abduction

Which of the following is not a true statement comparing exoskeletons and endoskeletons?

  1. Endoskeletons can support larger organisms.
  2. Only endoskeletons can grow as an organism grows.
  3. Exoskeletons provide greater protection of the internal organs.
  4. Exoskeletons provide less mechanical leverage.
See all solutions

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