cardiovascular system

Describes the role of the heart, how and why the heart circulates blood, how exercise and proper diet can keep the heart strong, what happens during a heart attack, and more.

An illustrated exploration of the circulatory system that follows a red blood cell through the body, describing each part and its function.

Introduces the circulatory system, its purpose, parts, and functions.

Provides a simple introduction to how the heart and circulatory system work.

Discusses how the heart and circulatory system work, the functions of blood, how doctors help people with blood and heart disorders, and how to keep the cardiovascular system healthy through diet and exercise.