10 Questions
What is the approximate size of the human heart?
Size of a closed fist
How many chambers does the heart have in humans, mammals, and birds?
Four
What is the name of the protective sac enclosing the heart?
Pericardium
Which cells determine the rhythm of the heart's blood pumping?
Pacemaker cells in the sinoatrial node
Which layer makes up the outermost part of the heart wall?
Epicardium
What was the cause of the American Civil War?
Dispute over whether slavery would be permitted to expand into the western territories
Who opposed slavery's expansion into the western territories?
Abraham Lincoln
How many states initially seceded from the United States to form the Confederacy?
Seven
Where did most of the intense combat of the American Civil War take place?
Mostly in the South
Who led the Confederacy during the American Civil War?
Jefferson Davis
Test your knowledge about the heart and its role in the circulatory system. Learn about the structure and function of this vital organ.
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