What are the tree main parts of the circulatory system?
Blood, blood vessels, and the heart
What is the liquid substance in our body that transports nutrients, oxygen, and waste products?
Blood
What type of blood cells carry oxygen?
Red blood cells
What type of blood cells protect the body from germs and disease?
White blood cells
What are the fragments of old cells in the blood?
Platelets
What blood vessels carry blood from the heart to the organs?
Arteries
What type of blood vessels carry blood to the heart from the organs?
Veins
What type of blood vessels carry blood into the organs?
Capillaries
True or false: the heart is a muscle that beats without stopping.
True
What is the contraction of the heart?
Systole
What is the relaxation of the heart?
Diastole
True or false: the heart is divided in two halves.
True
Which circuit takes blood around the heart and lungs?
Pulmonary circuit
Which circuit takes blood around the rest of the body?
Systemic circuit
