CEA Human Anatomy & Biomechanics 3

Question 1

Which carpal bones are most commonly involved in carpal tunnel syndrome?

Accepted Answer

The tunnel is formed by carpal bones and the flexor retinaculum, not specific carpal bones alone

Answer

The carpal tunnel is an anatomical passageway bounded by eight carpal bones on three sides and the transverse carpal ligament (flexor retinaculum) on the palmar surface.

Question 2

A task requires a worker to maintain the arm elevated 90° for extended periods. Which structure is MOST at risk for impingement?

Accepted Answer

Supraspinatus tendon under the acromion

Answer

Sustained shoulder abduction to 90° compresses the supraspinatus tendon in the subacromial space, leading to impingement syndrome.

Question 3

In biomechanics, 'static loading' of muscles differs from 'dynamic loading' because:

Accepted Answer

Static loading impairs blood flow and accelerates fatigue faster

Answer

Static muscle contractions compress blood vessels, reducing oxygen delivery and metabolite removal, causing faster fatigue than rhythmic dynamic contractions.

Question 4

The lumbar vertebrae differ structurally from cervical vertebrae in that lumbar vertebrae have:

Accepted Answer

Much larger and wider vertebral bodies

Answer

Lumbar vertebrae bear the greatest compressive load and therefore have the largest, widest vertebral bodies in the spinal column.

Question 5

Grip strength is generally reduced when the wrist is held in which position?

Accepted Answer

Flexion or extreme extension

Answer

Wrist flexion shortens the finger flexors beyond their optimal length-tension relationship, and extreme extension overstretches them, both reducing grip force.

(CEA) Certified Ergonomics Associate Practice Test

(CEA) Certified Ergonomics Associate Practice Test

CEA Human Anatomy & Biomechanics 3