1. Why the cardiovascular system exists

The cardiovascular system is a _ network. It _. (3 things)

transport; brings materials to contact with cells, moves substances from one cell/organ to another, carries materials away from organs to be removed

What does the heart deliver? (4 things)

oxygen, nutrients, water, hormones, (and other)

What does the heart exchange?

Hormones and other signals that are released by a cell and travel through the blood. Also heat

What does the heart remove?

metabolic waste, carbon dioxide, and excess heat

Main role of heart:

pump that creates the pressure that drives blood through the system

Main role of arteries and arterioles:

Carry the blood away from the heart and regulate flow

Main role of capillaries:

Provide large surface for exchange between blood and tissues

Main role of venules and veins:

Return blood to the heart at a lower pressure

Why can’t our bodies remove substances through diffusion?

They are too big