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.

Nurse helping boy in hospital bed

What Causes a Low Pulse Oximeter Reading in Children?

A pulse oximeter measures the amount of hemoglobin saturated with oxygen. Oxygen saturation measured by pulse oximetry (SpO2) between 96 and 100 percent are considered normal, according to nursing instructor Kathy Lawrence, M.S.N. of the University of Texas Medical Branch.

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