physiology

3 articles · All tags

• The Placenta
  The temporary organ that connects fetus to mother — gas and nutrient exchange, immune tolerance, hormone production, and what happens at delivery.
• Action Potentials
  The electrical pulse neurons use to send signals: resting potential, ion channels, and the all-or-none wave that travels down axons.
• Homeostasis
  How the body keeps its internal environment stable — temperature, pH, glucose, and more — through negative feedback loops.