What is the approximate size of the human heart?

• The size of a fist

• The size of a foot

• The size of a tennis ball

• The size of a grapefruit

Which direction is the apex (tip) of the heart pointed?

• Towards the right shoulder

• Towards the left hip

• Towards the left shoulder

• Towards the right hip

How many times does the heart contract per minute on average?

• 50 times

• 72 times

• 100 times

• 120 times

If the heart pumps enough blood in one year to fill an Olympic sized swimming pool, what does this suggest about the heart's function?

• The heart is a weak organ

• The heart pumps a large volume of blood continuously

• The heart only works during exercise

• The heart stores blood

Tags

NGSS.MS-LS2-3

What is the protective layer of tissue that covers the surface of the heart called?

• Myocardium

• Endocardium

• Pericardium

• Epicardium

Which of the following is NOT a layer of the pericardium?

• Fibrous pericardium

• Serous pericardium

• Parietal pericardium

• Cardiac muscle

Tags

NGSS.MS-LS4-2

What is the main function of the fibrous pericardium?

• Produces lubricating fluid

• Anchors the heart in place and provides protection

• Pumps blood

• Contracts to move blood

Which layer of the pericardium produces lubricating fluid to reduce friction of the heart against other tissues?

• Fibrous pericardium

• Serous pericardium

• Cardiac muscle

• Endocardium

Explain how the structure of the pericardium helps protect the heart and reduce friction during heart movement.

• The fibrous pericardium anchors the heart and the serous pericardium produces fluid to reduce friction.

• The pericardium contracts to pump blood.

• The pericardium absorbs nutrients for the heart.

• The pericardium generates electrical impulses.

Which of the following is the thick, twisting bundle of cardiac muscle that provides contractions in the heart?

• Epicardium

• Myocardium

• Endocardium

• Pericardium