Practice IB Sports, exercise and health science (SEHS) Topic B.1 Generating Movement in the Body with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for B.1 Generating Movement in the Body and mirrors Paper 1A, 1B, 2 style where relevant.
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What is the functional trade-off of the third-class lever system shown in this biceps curl?
What type of joint is shown in the image?
What is the main mechanical advantage of the lever system shown in the image?
Which spinal condition is shown in the right-hand panel of the image?
Cardiac troponin (cTn) is a key protein involved in the regulation of muscular contraction in cardiac muscle, through interaction with actin, tropomyosin, and calcium ions during the sliding filament mechanism. This study evaluated the effect of endurance exercise (marathon running) on cTn release in 151 athletes using serological data. Figure A shows the time course of exercise-induced cTn concentration changes. Figure B displays individual post-marathon cTnI levels relative to the upper reference limit (URL) for normal.
https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.121.056208
Refer to Figure A. At what time interval is peak cTn concentration observed post-exercise?
Refer to Figure B. Calculate the percentage of individuals who had post-marathon cTn concentrations above the normal URL.
Cardiac troponin is part of the regulatory system in cardiac muscle contraction. Identify the role of troponin in the sliding filament mechanism.
Given that cTn concentrations return to normal within 72 hours, evaluate whether this pattern supports a physiological rather than pathological role for cTn release in endurance athletes.