This page is for personal education and reflection only. It is not medical advice and does not replace professional clinical guidance.
Heart & Blood Vessels
The cardiovascular system is the body's transport network — delivering oxygen and nutrients to every cell and removing waste. Understanding it gives you a clear map for protecting one of the most modifiable determinants of how long and how well you live.
Updated July 20, 2025
Chapters — 7
The circulation system
How blood flows through two loops — pulmonary and systemic — and why the vascular network is the foundation of everything else.
Heart anatomy & function
Four chambers, four valves, one pacemaker — how the heart is built and how exercise changes it.
Blood pressure
What the numbers mean, why hypertension is called the silent killer, and how to keep pressure in a healthy range.
Cholesterol & atherosclerosis
How plaques form in arterial walls, what LDL and HDL actually do, and why inflammation is the mechanism that matters.
Exercise & heart fitness
Zone 2 training, VO2 max, and why physical fitness is one of the strongest predictors of cardiovascular longevity.
Risk factors & prevention
Modifiable vs. non-modifiable risk, the key screenings to get, and what questions to ask your doctor.
Warning signs & check-ups
Emergency symptoms that require immediate action, symptoms to discuss with a doctor, and a simple screening schedule.