physiology

4 articles · All tags

• How the Heart Works: Chambers, Valves, and the Cardiac Cycle
  The heart is a four-chambered muscular pump. Learn how blood flows through its chambers and valves, how it keeps its rhythm, and what a heartbeat actually is.
• 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.