Heart
While it varies, an adult human heart is typically described as being about the size of this, used to knock on a door.
What is a closed fist?
The main organ of the cardiovascular system.
What is the heart?
The main function of the cardiovascular system.
What is to pump blood to the body, transport nutrients, oxygen, and waste?
The heart contains this exact number of muscular systems or chambers to hold blood for a short time.
What is 4?
This is what blood from the body into the heart before it is moved to the lungs is called.
What is deoxygenated blood?
The number of circuits the cardiovascular system revolves around.
What is 2?
This type of impulse makes the heart beat and causes blood to move through its chambers.
What are electrical impulses?
The main difference between arteries and veins.
What is arteries carry blood away from the heart, and veins carry blood towards the heart?
The names of the two circuits of the cardiovascular system.
What is pulmonary circulation (lungs) and systematic circulation (body)?
This bodily system works to control the heart.
What is the nervous system/the brain?
How much of the body's blood the veins hold at any time.
What is 70%?
The things used by the circuits to maintain homeostasis.
What is electrical signals and pressure gradients?