Human Heart Histology
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Questions and Answers

What is the main component of the middle layer of circulatory vessels?

  • Elastic fibers and nerve cells
  • Smooth muscle cells and fibrous connective tissue (correct)
  • Endothelial cells and collagen fibers
  • Pericytes and elastic tissue

Where can the middle layer of circulatory vessels be completely absent?

  • Capillaries (correct)
  • Arteries
  • Myocardium
  • Veins

What creates a capillary network in the middle and outer layers of arteries?

  • Lymphatic capillaries
  • Vasa vasorum (correct)
  • Nervi nervorum
  • Endothelial cells

How is the innervation of large blood vessels primarily carried out?

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

Which layer of the heart consists of typical muscle cells called cardiac myocytes?

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

What is the function of the conduction system of the heart?

<p>Regulating the heartbeat rhythm (B)</p> Signup and view all the answers

Where are Purkinje cells found in the heart?

<p>In the subendocardial layer (C)</p> Signup and view all the answers

What type of cells are present in the endocardium?

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

What is the main function of the circulatory system?

<p>To ensure continuous movement of blood to and from the heart and tissues (A)</p> Signup and view all the answers

What is NOT a component of the Circulatory System (CIS)?

<p>Muscles (A)</p> Signup and view all the answers

How does lymph move within the lymph circulation system?

<p>It is collected in vessels with a larger diameter that drain into the circulatory system (D)</p> Signup and view all the answers

Which layer forms the innermost part of blood vessels in the circulation system?

<p>Endothelial cells and basement membrane (D)</p> Signup and view all the answers

What is the main component of the middle layer of capillaries?

<p>Smooth muscle cells (A)</p> Signup and view all the answers

Which type of capillaries has a lumen lined by a continuous layer of endothelial cells?

<p>Capillaries with continuous endothelium (B)</p> Signup and view all the answers

What are the rare cells found on the outside of capillaries?

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

What is the range of diameters for capillaries, including sinusoids, as mentioned in the text?

<p>$7-9$ micrometers to $30-40$ micrometers (A)</p> Signup and view all the answers

What gives elastic arteries their yellow color?

<p>Presence of elastin (D)</p> Signup and view all the answers

How does the elastic tissue in muscular arteries differ from that in elastic arteries?

<p>Muscular arteries have only two elastic layers (C)</p> Signup and view all the answers

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

<p>To supply the capillary network (C)</p> Signup and view all the answers

How does the inner layer of arterioles compare to that of other types of arteries?

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

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