The Heart
On average, what is the normal cardiac output of a healthy person?
5.3 liters per minute
What is the difference between an artery and a vein?
A. Arteries carry blood away from the heart; veins carry blood to the heart.
The main purpose of the aortic valve is to
A. keep blood from flowing from the ventricle back into the aorta.
What is the bundle of His?
C. a collection of heart muscle components specializing in electrical conduction that allow the ventricles to contract
The main purpose of the mitral valve is to
D. keep blood from flowing back to the left atrium from the left ventricle.
What are Purkinje fibers?
D. special fibers that relay electrical impulses to the ventricles, which cause contraction
Why is forward blood flow important for the circulation process? Check all that apply.
It ensures that the circulation process is successful. It ensures that oxygen-rich blood is delivered to the body. It ensures that oxygen-depleted blood is returned to the lungs.
How is the pulmonary artery different from other arteries in the body?
The pulmonary artery carries oxygen-deficient blood.
What are the small grapelike sacs that exchange gases in the lungs called?
alveoli
What is the process called when the body forms new blood vessels?
angiogenesis
What are the names of all of the valves in the heart? Check all that apply.
aortic valve mitral valve pulmonary valve tricuspid valve
Which of the following are classified as blood vessels? Check all that apply.
arteries capillaries veins
What is the proper name for the electrical system in the heart?
conduction system
What's another scientific term for the conductive system of the heart?
electrophysiology of the heart
What layer of the heart has direct contact with the blood?
endocardium
How many chambers does the human heart have?
four
How many valves are in the heart?
four
What are the chambers of the heart referred to as? Check all that apply.
left and right ventricles left and right atriums
What are the two upper chambers of the heart called?
left atrium right atrium
What part of the heart is responsible for pumping oxygen-rich blood to the rest of your body such as your arms and legs?
left ventricle
What cardiac layer of the heart is the most dense and fibrous?
myocardium
What is the name of the cardiac layer that is the strongest?
myocardium
What are the primary gases that are exchanged in the lungs?
oxygen carbon dioxide
The primary purpose of heart valves is to
prevent blood from flowing backward.
Which artery carries oxygen-poor blood?
pulmonary artery
What type of circulation involves the exchanges of gases?
pulmonary circulation
What two circulation systems involve the movement of blood from the heart to the lungs and to the body?
pulmonary circulation systemic circulation
What are the two lower chambers of the heart called?
right ventricle left ventricle
The atrioventricular node (AV node) does which of the following?
sends electrical impulses to the His bundle
Which are electrical "nodes" of the heart? Check all that apply.
sinoatrial node atrioventricular node
What type of circulation involves the movement of blood to the rest of the body (such as the legs)?
systemic circulation
How many cardiac layers are in the human heart?
three
In the systemic circulation, what kind of blood vessel carries blood from the body back to heart?
veins
