Human Heart Histology

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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?

Nervi nervorum Signup and view all the answers

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

Myocardium Signup and view all the answers

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

Regulating the heartbeat rhythm Signup and view all the answers

Where are Purkinje cells found in the heart?

In the subendocardial layer Signup and view all the answers

What type of cells are present in the endocardium?

Endothelial cells Signup and view all the answers

What is the main function of the circulatory system?

To ensure continuous movement of blood to and from the heart and tissues Signup and view all the answers

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

Muscles Signup and view all the answers

How does lymph move within the lymph circulation system?

It is collected in vessels with a larger diameter that drain into the circulatory system Signup and view all the answers

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

Endothelial cells and basement membrane Signup and view all the answers

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

Smooth muscle cells Signup and view all the answers

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

Capillaries with continuous endothelium Signup and view all the answers

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

Pericytes Signup and view all the answers

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

$7-9$ micrometers to $30-40$ micrometers Signup and view all the answers

What gives elastic arteries their yellow color?

Presence of elastin Signup and view all the answers

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

Muscular arteries have only two elastic layers Signup and view all the answers

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

To supply the capillary network Signup and view all the answers

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

Very thin Signup and view all the answers