Human Anatomy & Biomechanics Flashcards
7 cards from real CEA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Human Anatomy & Biomechanics flashcards as text
Which carpal bones are most commonly involved in carpal tunnel syndrome?
Answer: The tunnel is formed by carpal bones and the flexor retinaculum, not specific carpal bones alone
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.
A task requires a worker to maintain the arm elevated 90° for extended periods. Which structure is MOST at risk for impingement?
Answer: Supraspinatus tendon under the acromion
Sustained shoulder abduction to 90° compresses the supraspinatus tendon in the subacromial space, leading to impingement syndrome.
In biomechanics, 'static loading' of muscles differs from 'dynamic loading' because:
Answer: Static loading impairs blood flow and accelerates fatigue faster
Static muscle contractions compress blood vessels, reducing oxygen delivery and metabolite removal, causing faster fatigue than rhythmic dynamic contractions.
The lumbar vertebrae differ structurally from cervical vertebrae in that lumbar vertebrae have:
Answer: Much larger and wider vertebral bodies
Lumbar vertebrae bear the greatest compressive load and therefore have the largest, widest vertebral bodies in the spinal column.
Grip strength is generally reduced when the wrist is held in which position?
Answer: Flexion or extreme extension
Wrist flexion shortens the finger flexors beyond their optimal length-tension relationship, and extreme extension overstretches them, both reducing grip force.
Which anatomical structure transmits force from the Achilles tendon to the foot during standing and walking?
Answer: Calcaneus (heel bone)
The Achilles tendon attaches directly to the posterior surface of the calcaneus, which absorbs and transmits ground reaction forces.
When analyzing a pushing task, the mechanical advantage of using a long-handled tool instead of a short one is that it:
Answer: Increases the moment arm, reducing the force needed to achieve the same torque
A longer handle increases the moment arm from the pivot point, allowing the same torque with less applied force (F = T/d).