How the Circulatory System Feeds the Brain

Power Supply Line: The circulatory system delivers the oxygen and glucose your brain needs to stay alive and alert.
Energy Hog: Though it’s only 2% of your body weight, the brain uses about 20% of your blood’s oxygen supply.
Constant Flow: Even a few seconds without blood can cause dizziness—minutes can lead to brain damage.
Artery Network: Major arteries branch into smaller vessels, forming a vast web that nourishes every brain region.
The Blood-Brain Barrier: Special vessel walls let in nutrients but block toxins, keeping the brain’s environment pristine.
Oxygen Express: Each heartbeat sends a surge of oxygen-rich blood racing to billions of neurons.
Glucose Delivery: Blood carries sugar that powers thought, memory, and movement—it’s the brain’s main fuel.
Waste Removal: The circulatory system also carries away carbon dioxide and metabolic waste from active brain cells.
Flow Adjustment: Blood vessels in the brain expand or contract to match your mental workload in real time.
Thinking in Motion: Every idea, emotion, and memory depends on the steady rhythm of blood feeding your brain.