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
Tendinopathy in occupational settings most commonly develops in tendons that experience:
Answer: Repetitive mechanical loading exceeding the tendon's recovery capacity
Repetitive sub-maximal loading without adequate recovery time leads to collagen micro-tears and failed healing, resulting in tendinopathy.
The 'thoracic outlet' syndrome involves compression of neurovascular structures between:
Answer: The clavicle/first rib and scalene muscles
Thoracic outlet syndrome results from compression of the brachial plexus and subclavian vessels between the first rib, clavicle, and scalene muscles.
During manual material handling, increasing the horizontal distance of the load from the body increases injury risk primarily because:
Answer: It dramatically increases the bending moment at the lumbar spine
A greater horizontal distance multiplies the load's moment arm at L5/S1, exponentially increasing compressive and shear forces on lumbar discs.
The rotator cuff is a group of four muscles whose primary function is to:
Answer: Stabilize the humeral head in the glenoid fossa during arm movement
The rotator cuff muscles (supraspinatus, infraspinatus, teres minor, subscapularis) compress the humeral head into the shallow glenoid to prevent dislocation.
Which of the following best describes 'contact stress' as an ergonomic risk factor?
Answer: Localized pressure on soft tissue from a hard or sharp edge
Contact stress occurs when a hard or sharp work surface edge concentrates mechanical pressure on a small area of soft tissue, compressing nerves and vessels.
Synovial fluid in joints serves all of the following functions EXCEPT:
Answer: Conducting nerve signals between joint surfaces
Synovial fluid lubricates, nourishes cartilage, and provides some cushioning, but neural signal conduction is performed by joint receptor nerves, not synovial fluid.
In the context of hand tool design, 'trigger finger' (stenosing tenosynovitis) is most associated with:
Answer: Repetitive forceful finger flexion causing tendon sheath inflammation
Repetitive gripping and finger flexion inflames the tendon sheath, causing thickening that catches the tendon and creates the characteristic locking sensation.