Peristalsis: The Muscle Wave That Moves Food Without Gravity
Wait, gravity is optional. Peristalsis, the muscle wave that moves food, lets you swallow upside down because your esophagus squee…
◆ Subject
Health
9 sourced explainers about health from Signal by Avaryn.
What The Renal Filter Reveals About Your Body
Kidneys do something bizarre. They filter about 180 liters a day, yet only around two liters become urine. The real trick is not d…
Nociception: The Neural Pathways of Pain Perception
Wounds don't feel pain. When cells break apart, they release chemical debris. Tiny nerve endings called nociceptors detect that de…
Synaptic Plasticity: The Physical Rewiring of Learning
Your brain doesn’t download skills. It rebuilds itself. Synaptic plasticity is learning made physical: every repetition reshapes t…
What The Vestibular System Reveals About Your Body
Wild part: your balance runs on liquid. Inside the vestibular system behind each ear, shifting fluid tells your brain when you til…
Nociception: The Neural Architecture of Pain Signals
Pain lies to you first. Before pain exists, a cut or burn spills warning chemicals into tissue, and tiny nerve endings convert tha…
Sleep Architecture: The Mechanics of Memory Consolidation
Your brain works hardest asleep. Sleep architecture is not blackout time. It runs in repeating cycles, and each cycle solves a dif…
Insulin Resistance: How Cells Ignore the Glucose Signal
Your cells are starving — surrounded by sugar. Insulin normally works like a key. It locks into receptors on each cell and trigger…
Caffeine and Adenosine: Why You Feel Awake but Still Tired Later
You feel awake after caffeine because it blocks adenosine receptors. Adenosine is one of the signals that makes you feel sleepier …