The central organ in the circulatory system is the _______
heart
The heart pumps blood around the body through ____ ________
blood vessels
______ collects, transports, and releases gases nutrients and waste products around the body.
blood
________ take blood from the heart to the rest of the body
arteries
_____ take blood to the heart.
veins
_____ _____________ are the smallest type of blood vessel. They connect the veins and the arteries.
blood capillaries
The heart _____ and _______ the blood into the arteries.
contracts and pumps
The arteries _____ and become blood capillaries.
divide
step 1: The blood collects ______ and releases carbon dioxide into the alveoli.
oxygen
Step 2: collects _______ from the small intestine.
nutrients
Step 3: releases ________ and ________ into the body organs.
oxygen, nutrients
Step 4: collects _____ ___________ from the body organs.
waste substances
Step 5: ______ waste substances.
releases
