Cardiovascular System Guide: Heart Health & Exercise Effects

What are the four parts of the cardiovascular system? Understand how exercise, smoking, and serotonin influence heart health and normal cholesterol ranges.

How to Read a Pulse Oximeter

Pulse oximeters are devices that are used to indirectly measure the amount of oxygen in the blood by measuring a quantity known as oxygen saturation, or SpO2. SpO2 is a measurement of the percentage of hemoglobin molecules that are bound to oxygen.

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