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Questions and Answers
Which layer of the heart wall is also shared by the pericardial membrane?
Which layer of the heart wall is also shared by the pericardial membrane?
- Epicardium (correct)
- Pericardium
- Endocardium
- Myocardium
What is the function of the pericardium?
What is the function of the pericardium?
- To regulate the heart rate
- To reduce friction between the heart and surrounding structures (correct)
- To hold the heart in place
- To provide nutrients to the heart
Where is the heart located within the thoracic cavity?
Where is the heart located within the thoracic cavity?
- At the top of the thoracic cavity
- To the left of the midline (correct)
- To the right of the midline
- At the bottom of the thoracic cavity
What is the size of the heart?
What is the size of the heart?
What is the pericardial cavity filled with?
What is the pericardial cavity filled with?
Which layer of the heart wall is composed of cardiac muscle?
Which layer of the heart wall is composed of cardiac muscle?
Which chamber of the heart receives blood from the superior and inferior vena cava and the coronary sinus?
Which chamber of the heart receives blood from the superior and inferior vena cava and the coronary sinus?
Which valve prevents blood flowing from the ventricles back into the atria?
Which valve prevents blood flowing from the ventricles back into the atria?
Which ventricle has thicker walls due to pumping blood throughout the body to locations where the resistance to blood flow is greater?
Which ventricle has thicker walls due to pumping blood throughout the body to locations where the resistance to blood flow is greater?
Which valve allows the ejection of blood from the heart into the arteries but prevents the back flow of blood into the ventricles?
Which valve allows the ejection of blood from the heart into the arteries but prevents the back flow of blood into the ventricles?
Which of the following factors determines stroke volume?
Which of the following factors determines stroke volume?
According to the Frank-Starling law of the heart, what happens to the force of contraction during systole when there is a greater preload on cardiac muscle fibers?
According to the Frank-Starling law of the heart, what happens to the force of contraction during systole when there is a greater preload on cardiac muscle fibers?
What does the Frank-Starling law of the heart state about the output of the right and left ventricles?
What does the Frank-Starling law of the heart state about the output of the right and left ventricles?
Which side of the heart is involved in systemic circulation?
Which side of the heart is involved in systemic circulation?
Which of the following factors influences heart rate?
Which of the following factors influences heart rate?
What is the function of coronary circulation?
What is the function of coronary circulation?
What is the body's principal mechanism of short-term control over cardiac output and blood pressure?
What is the body's principal mechanism of short-term control over cardiac output and blood pressure?
What are the principal arteries branching from the ascending aorta that carry oxygenated blood?
What are the principal arteries branching from the ascending aorta that carry oxygenated blood?
What is the role of the atrioventricular (AV) node in the conducting system of the heart?
What is the role of the atrioventricular (AV) node in the conducting system of the heart?
What happens when the components of the conduction system are disrupted?
What happens when the components of the conduction system are disrupted?
Which of the following represents the conduction time from the beginning of atrial excitation to the beginning of ventricular excitation?
Which of the following represents the conduction time from the beginning of atrial excitation to the beginning of ventricular excitation?
What does the S-T segment represent in an electrocardiogram (ECG)?
What does the S-T segment represent in an electrocardiogram (ECG)?
What is the first heart sound (lubb) created by?
What is the first heart sound (lubb) created by?
What does the second heart sound (dupp) represent?
What does the second heart sound (dupp) represent?
What is cardiac output (CO)?
What is cardiac output (CO)?
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