Human Heart Anatomy Quiz

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What is the approximate weight range of the human heart?

600-700 grams
400-500 grams
250-350 grams (correct)
100-200 grams

Where is the point of maximal intensity (PMI) located?

Between the fourth and fifth ribs on the left side of the chest
Between the fifth and sixth ribs below the left nipple (correct)
Between the seventh and eighth ribs on the right side of the chest
Between the second and third ribs on the right side of the chest

Which layer of the heart is responsible for its pumping action?

Pericardium
Epicardium
Myocardium (correct)
Endocardium

What is the function of the serous fluid within the pericardial cavity?

To reduce friction during heart activity (A) Signup and view all the answers

Which of the following are considered layers of the heart wall?

Epicardium, Myocardium, Endocardium (C) Signup and view all the answers

What is the primary composition of the myocardium?

Cardiac muscle (B) Signup and view all the answers

What is the role of the fibrous skeleton in the heart?

Limits the spread of action potentials into defined pathways (A) Signup and view all the answers

Which layer of the heart lines the heart chambers and covers the fibrous skeleton of the valves?

Endocardium (D) Signup and view all the answers

What structure separates the smooth portion of each atrium from the anterior muscle bundles?

Crista terminalis (D) Signup and view all the answers

How do the atria primarily contribute to blood propulsion?

By contracting minimally to push blood into the ventricles (B) Signup and view all the answers

What is the dense network formed by the connective tissue fibers in the myocardium called?

Fibrous skeleton (D) Signup and view all the answers

What distinguishes the atria from the ventricles in terms of muscle tissue?

Ventricles are thicker and more muscular (C) Signup and view all the answers

Which feature marks the location of the foramen ovale in the fetal heart?

Fossa ovalis (D) Signup and view all the answers

Apex of the Heart

The pointed end of the heart, located inferiorly toward the left hip. It's the point where the heart beats most strongly against the chest wall.

Pericardium

A double-walled sac that surrounds the heart, protecting it, anchoring it to surrounding structures, and preventing overfilling.

Myocardium

The thickest layer of the heart wall, composed of cardiac muscle tissue. This is the layer responsible for the pumping action of the heart.

Epicardium

The outermost layer of the heart wall, also known as the visceral pericardium. It's a smooth, thin layer that helps reduce friction during heartbeats.