Skeletal muscle Skin Skull Sleep Sliding-filament mechanism Small intestine Smooth muscle Sodium-potassium ATPase Soft palate Solution Somatic cell division Somatic nervous system Somite Spasm Spasticity Spermatic cord Spermatogenesis Sperm cell Spermiogenesis	Sphincter Sphincter of the hepatopancreatic ampulla Sphygmomanometer Spinal cord Spinal nerve Spinal shock Spinothalamic tracts Spinous process Spiral organ Spirometer Splanchnic Spleen Spongy bone tissue Sputum Squamous Starling's law of the capillaries Starling's law of the heart Starvation Stasis	Static equilibrium Stellate reticuloendothelial cell Stenosis Stereocilia Stereognosis Sterile Sterilization Stimulus Stomach Straight tubule Stratum Stratum basalis Stratum functionalis Stressor Stretch receptor Stretch reflex Stroke volume Stroma