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
The 'length-tension relationship' in muscle physiology means that:
Answer: Muscles produce maximum force at an optimal intermediate length
Muscles generate peak force when sarcomere lengths allow optimal overlap between actin and myosin filaments, typically at resting length.
Which nerve is at greatest risk during sustained elbow flexion beyond 90° in a worker using a hand-held tool?
Answer: Ulnar nerve
The ulnar nerve passes through the cubital tunnel at the medial elbow and is compressed or stretched by prolonged elbow flexion.
The center of gravity of the human body in the anatomical position is located approximately:
Answer: At the S2 sacral vertebra level, anterior to the spine
The human center of gravity is typically located just anterior to the second sacral segment, roughly 55-57% of total standing height.
Prolonged standing on hard floors without anti-fatigue matting primarily causes discomfort due to:
Answer: Reduced venous return and static muscle loading in lower extremities
Hard surfaces reduce leg muscle pumping action, impairing venous return from the legs and causing pooling, edema, and fatigue.
In occupational biomechanics, 'cumulative trauma' refers to disorders caused by:
Answer: Repeated low-level exposures that accumulate tissue damage over time
Cumulative trauma disorders result from repeated microtrauma that accumulates faster than tissue repair, eventually causing clinical injury.
The intervertebral disc acts as a shock absorber primarily because of:
Answer: The nucleus pulposus, which distributes compressive forces radially
The gel-like nucleus pulposus absorbs compression by redistributing forces radially to the annulus fibrosus, like a pressurized hydraulic cushion.
Which of the following best describes the 'coupling' risk factor in ergonomics?
Answer: The quality of the hand-to-object interface affecting grip and force
Coupling refers to how well the hand interfaces with the object being handled — poor coupling (slippery, sharp, absent handles) increases required grip force.