Circulatory System

The structure responsible for pumping blood throughout the body is

How many chambers does the human heart have?

What are the flaps of tissue found in veins, that prevent blood from flowing backward?

What are the 4 blood groups?

These structures located between the 2 atrium and the 2 ventricles that keep blood flowing in ONE DIRECTION are called

A group of cells located in the right atrium responsible for sending signals to other chambers causing them to contract is

The alternating expansion and relaxation of the artery wall caused by contraction of the left ventricle is

Which component of blood makes up the majority (highest percent)?

An iron-containing protein found in red blood cells is

Platelets are important for which process?