physiology

8 articles · All tags

• Blood Pressure Explained: What the Two Numbers Mean
  Blood pressure is the force of blood against artery walls, written as systolic over diastolic in mmHg. Learn what each number measures and how readings are rated.
• How the Body Balances Water and Causes Dehydration
  Dehydration happens when losses outpace intake. The body prevents it by balancing water through urine, sweat and breath, guided by thirst, hormones and kidneys.
• Bone Remodeling and Osteoporosis: How Bone Renews Itself
  Bone remodeling is a lifelong cycle that removes old bone and lays down new bone, and osteoporosis develops when removal outpaces replacement, leaving bones fragile.
• How General Anesthesia Works: Plain-Language Explanation
  General anesthesia uses drugs that reversibly switch off consciousness and pain in the brain, while doctors keep breathing and circulation supported during surgery.
• 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.