Anatomy of the Heart Wall

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Questions and Answers

What happens to heart rate when the sympathetic nervous system (SyNS) is increased?

  • It increases (correct)
  • It becomes irregular
  • It decreases
  • It remains the same

Which hormone increases heart rate and contractility?

  • Thyroid hormone
  • Epinephrine
  • Norepinephrine
  • All of the above (correct)

What is the term for the degree of stretch on the heart before it contracts?

  • Afterload
  • Contractility
  • Stroke volume
  • Preload (correct)

What is affected by the duration of ventricular diastole and venous return?

<p>End diastolic volume (C)</p> Signup and view all the answers

What is the result of increased parasympathetic nervous system (PaNS) activity?

<p>Decreased heart rate (D)</p> Signup and view all the answers

What is the Frank-Starling law related to?

<p>The relationship between preload and stroke volume (B)</p> Signup and view all the answers

What is the function of the pericardial fluid in the pericardial cavity?

<p>To reduce friction between the heart wall and pericardium (B)</p> Signup and view all the answers

What is the layer of the heart wall that is in contact with the pericardial cavity?

<p>Epicardium (C)</p> Signup and view all the answers

What happens when the ventricles contract?

<p>The AV valves close, and the pulmonary and aortic valves open (B)</p> Signup and view all the answers

What is the main function of the myocardium?

<p>To contract and pump blood through the heart (B)</p> Signup and view all the answers

What is the function of the papillary muscles?

<p>To prevent the AV valves from being forced open in the opposite direction (D)</p> Signup and view all the answers

What is the interatrial septum?

<p>A dividing wall between the two atria (A)</p> Signup and view all the answers

What is the heart sound 'lub' produced by?

<p>The blood turbulence associated with the closing of the AV valves (D)</p> Signup and view all the answers

What is the function of the right side of the heart?

<p>To pump deoxygenated blood to the lungs (C)</p> Signup and view all the answers

What is the function of the right atrioventricular (AV) valve?

<p>To allow blood to flow from the right atrium to the right ventricle (B)</p> Signup and view all the answers

What is the endothelium?

<p>A layer of simple squamous epithelium (D)</p> Signup and view all the answers

What is the function of the coronary circulation?

<p>To provide oxygenated blood to the heart muscle (A)</p> Signup and view all the answers

What is the sequence of the conduction system in the heart?

<p>SA node, AV node, bundle of His, bundle branches, ventricles (B)</p> Signup and view all the answers

What is the main function of capillaries in the exchange vessels?

<p>To exchange substances between the blood and the tissues (A)</p> Signup and view all the answers

What is the structure of blood vessel walls, except capillaries?

<p>A 3-layered arrangement of tunica intima, tunica media, and tunica externa (A)</p> Signup and view all the answers

What is the term for a decrease in lumen size?

<p>Vasoconstriction (D)</p> Signup and view all the answers

What is the function of the tunica intima layer?

<p>To provide a simple squamous epithelium and a basement membrane (C)</p> Signup and view all the answers

What is the term for the process of venules merging to form progressively larger veins?

<p>Venous convergence (D)</p> Signup and view all the answers

What is the primary function of hemoglobin in red blood cells?

<p>To carry oxygen (A)</p> Signup and view all the answers

What is the term for the formation of red blood cells?

<p>Hemopoiesis (C)</p> Signup and view all the answers

What is the function of neutrophils in the immune system?

<p>To fight off bacterial infections (D)</p> Signup and view all the answers

What is the term for an increased white blood cell count?

<p>Leukocytosis (C)</p> Signup and view all the answers

What is the term for the average blood pressure in the arteries?

<p>Mean arterial pressure (A)</p> Signup and view all the answers

What is the primary function of the lymphatic system?

<p>To drain excess interstitial fluid (C)</p> Signup and view all the answers

What is the term for the fluid that flows through the lymphatic system?

<p>Lymph (B)</p> Signup and view all the answers

What is the function of lymph nodes in the lymphatic system?

<p>To filter out foreign substances (C)</p> Signup and view all the answers

What is the term for the two main lymphatic ducts?

<p>Thoracic duct and right lymphatic duct (D)</p> Signup and view all the answers

What is the term for the process by which lymph flows through the lymphatic system?

<p>Lymphatic flow (D)</p> Signup and view all the answers

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