What are the main components of the cardiovascular system?

Step 1: Identify the components of the cardiovascular system.
The cardiovascular system is composed of three main elements that work together to circulate blood throughout the body.

The components are:

• The heart, which acts as the pump.
• Blood vessels (arteries, veins, and capillaries), which form the network of tubes for blood transport.
• Blood, the fluid that carries oxygen, nutrients, hormones, and waste products.

The components of the cardiovascular system are:
$\boxed{\text{The heart, blood vessels, and blood.}}$