Anatomy & Physiology Saladin 9th Edition: Heart Valve Structure Quiz
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Anatomy & Physiology Saladin 9th Edition: Heart Valve Structure Quiz

Test your knowledge on heart valve structure originating from dense irregular connective tissue, providing support and electrical insulation, enabling independent contractions, with tendinous cords extending to papillary muscles. Identify thin strands preventing cusp inversion. Image reference from Figure 19.8 in Saladin Anatomy & Physiology 9th edition.

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Questions and Answers

What is the function of arteries in the circulatory system?

Carry blood from the heart to capillaries

Where is the location of the heart described in the text?

Above the lungs

Which membrane lining forms the epicardium of the heart?

Visceral layer of serous pericardium

What is the purpose of the pericardial fluid in the heart?

<p>Reduces friction between layers when heart contracts and expands</p> Signup and view all the answers

Which layer of the heart wall provides force for contraction?

<p>Myocardium</p> Signup and view all the answers

What is the main function of veins in the circulatory system?

<p>Carry blood from capillaries to the heart</p> Signup and view all the answers

What is the broad base of the heart attached to?

<p>Large blood vessels</p> Signup and view all the answers

Which layer of the pericardium is described as a tough, unyielding membrane?

<p>Outer fibrous pericardium</p> Signup and view all the answers

What is the primary objective of the presentation on the cardiovascular system?

<p>To describe the protective coverings of the heart.</p> Signup and view all the answers

Which type of blood do blue-colored blood vessels carry according to the text?

<p>Deoxygenated blood</p> Signup and view all the answers

What is the purpose of the conducting system of the heart?

<p>Regulate heart rate and contraction strength</p> Signup and view all the answers

In the context of arteries, arterioles, capillaries, venules, and veins, what is a major difference between arteries and veins?

<p>Thickness of walls</p> Signup and view all the answers

What is the primary function of capillaries in the cardiovascular system?

<p>Exchange materials between blood and interstitial fluid</p> Signup and view all the answers

How are systemic and pulmonary circuits compared in terms of blood oxygenation?

<p><strong>Systemic</strong> circuit carries oxygenated blood, while <strong>pulmonary</strong> circuit carries deoxygenated blood.</p> Signup and view all the answers

Which part of the cardiovascular system is primarily responsible for regulating blood pressure?

<p><strong>Arterioles</strong></p> Signup and view all the answers

What is a significant function of major systemic veins discussed in the text?

<p><strong>Drain</strong> organs or body regions by returning deoxygenated blood to the heart.</p> Signup and view all the answers

During which phase of the cardiac cycle do the AV valves close and the semilunar valves open?

<p>Ventricular systole</p> Signup and view all the answers

What causes the heart sounds described as 'lub' and 'dup'?

<p>Closing of the AV valves</p> Signup and view all the answers

Which valve closes to prevent backflow from the arteries into the ventricles during the cardiac cycle?

<p>Aortic valve</p> Signup and view all the answers

What is the main function of atrial systole in the cardiac cycle?

<p>Forces blood into the ventricles</p> Signup and view all the answers

Which event marks the beginning of ventricular diastole in the cardiac cycle?

<p>Closing of the semilunar valves</p> Signup and view all the answers

What happens to blood pressure within a chamber during diastole in the cardiac cycle?

<p>Decreases</p> Signup and view all the answers

What is the role of atrial contraction during the cardiac cycle?

<p>Forces blood into relaxed ventricles</p> Signup and view all the answers

Which phase of the cardiac cycle involves an increase in blood pressure within the ventricles?

<p>Ventricular systole</p> Signup and view all the answers

What factor determines the cardiac output?

<p>Stroke volume</p> Signup and view all the answers

Which wave in an ECG represents ventricular repolarization?

<p>T wave</p> Signup and view all the answers

Why is the repolarization of the atria not detected in an ECG?

<p>It is masked by the stronger QRS complex</p> Signup and view all the answers

What happens to cardiac output during exercise?

<p>Increases</p> Signup and view all the answers

In the cardiac cycle, at what point is the blood forced into the pulmonary trunk and aorta?

<p>During ventricular depolarization</p> Signup and view all the answers

Which factor is responsible for the greater size of the QRS complex in an ECG?

<p>Greater muscle mass of the ventricles</p> Signup and view all the answers

What instrument is used to record the electrical current generated by the heart's conducting system?

<p>Electrocardiograph</p> Signup and view all the answers

What is the formula for calculating cardiac output?

<p>$CO = SV x HR$</p> Signup and view all the answers

Which type of heart valve is located at the base of the large arteries that carry blood from the ventricles?

<p>Semilunar valve</p> Signup and view all the answers

What is the function of tendinous cords in the heart valve structure?

<p>Prevent inversion of valve cusps</p> Signup and view all the answers

Which vessel returns blood from the head, neck, shoulders, upper limbs, and thoracic and lumbar regions to the right atrium?

<p>Superior vena cava</p> Signup and view all the answers

What is the main function of semilunar valves in the heart?

<p>Prevent backflow of blood into the ventricles</p> Signup and view all the answers

Where is the aortic valve located in the heart?

<p>Between left ventricle and aorta</p> Signup and view all the answers

What purpose do thin strands of dense regular connective tissue serve in heart valves?

<p>Support valve cusps</p> Signup and view all the answers

Which valve controls the opening from the right ventricle into the pulmonary trunk?

<p>Pulmonary valve</p> Signup and view all the answers

Why is there a need for electrical insulation between the atria and ventricles in the heart?

<p>To enable independent contraction of atria and ventricles</p> Signup and view all the answers

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