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The skin (integumentary system). It covers approximately 1.5–2 m² in adults, protects against infection, regulates body temperature, and provides sensory input.
206 bones. They are divided into the axial skeleton (skull, spine, ribs — 80 bones) and the appendicular skeleton (limbs, shoulders, pelvis — 126 bones).
The right atrium, right ventricle, left atrium, and left ventricle. The right side pumps blood to the lungs; the left side pumps oxygenated blood to the body.
The liver detoxifies chemicals, metabolizes drugs, produces bile for digestion, stores glycogen for energy, synthesizes proteins (including clotting factors), and filters blood from the digestive tract.
The cerebrum (thinking, movement, senses), cerebellum (balance, coordination), and brainstem (breathing, heart rate, consciousness). Together they control all bodily functions.