The study of the physical structures and functions of living organisms and their biological systems.
From 'bio-' (life) + 'physiology' (Greek physis, nature + -logia, study of). The prefix 'bio-' emphasizes the focus on life specifically, distinguishing it from general physiology of non-living systems.
Biophysiology explains why you can feel your heartbeat in your chest—it's the study of how the physical anatomy (the heart's chambers and valves) combines with function (pumping blood) to keep you alive.
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