Layers of the Heart

The heart is a ______, muscular organ about the size of a ______ located between the ______.

• The heart is a muscular organ about the size of a fist located between the lungs.

• The heart is a hollow organ about the size of a grapefruit located between the kidneys.

• The heart is a solid organ about the size of a hand located between the ribs.

• The heart is a fragile organ about the size of a thumb located between the shoulders.

How many times does the heart contract per minute?

Tags

NGSS.HS-LS1-3

What is the outermost layer of the heart known as?

• Myocardium

• Endocardium

• Epicardium

Which valve is located on the right side between the atria and ventricles?

• Bicuspid valve

• Tricuspid valve

• Aortic valve

• Pulmonary valve

Which veins are responsible for carrying blood to the left atrium?

What separates the right and left sides of the heart?

• Valves

• Septum

• Atria

• Vessels

Valves also regulate blood flow between the ventricles and the blood _______.

• vessels

• cells

• tissues

• organs

The role of the intrinsic conduction system in the heart is to:

• pump blood throughout the body

• regulate the heart rate and rhythm

• filter blood

• supply oxygen to the heart muscle

Fill in the blank: Diastole is the _______ of the heart and filling with blood.

• relaxation

• contraction

• pumping

• beating

What occurs during the ejection phase of systole?

• The ventricles contract and pump blood into the aorta and pulmonary artery.

• The atria contract and fill the ventricles with blood.

• The heart relaxes and fills with blood from the veins.

• The semilunar valves close to prevent backflow into the heart.