Veins. Heart

In what endothelial vessels there are internal and external elastic membranes?

• Veins of muscular type

• Arteriole

• Lymphatic vessels

• Arteries

The myocardium develops from:

• Miotoma

• Mesenchymas

• Endoderma

• None of the Above

What isn't characteristic of veins?

• Have valves

• Have the expressed internal elastic membrane

• The external cover is expressed better, than average

• Valves

Where cells of the carrying-out heart tissue are located:

• In an endocardium

•   In a myocardium, on border with endocardium

•   In a myocardium, on border with epicardium

• In an epicardium

The ventricular muscles accepts impulses directly from

•   AV node

• Bundle of His

• Purkinje system

• SA node

In large lymphatic vessels, smooth myocytes are located:

• in the middle shell

• in all shells

• in the outer shell

• in the inner shell

Which of the structural features does not apply to the veins?

• strong development of the internal elastic membrane

• weak development of the circular muscle layer, more frequent longitudinal arrangement of smooth myocytes

• a strong development of the adventitia and the weaker the inner and middle shells

• availability of valves

Pacemaker cells of the conducting system are located in …

• sinoatrial node

• ventriculonector

• the Purkinje fibers

• atrioventricular node

Morphological examination in histopreparation determines the vessel of irregular shape, the middle shell of which is formed by bundles of smooth myocytes and layers of connective tissue. What vessel is this?

• Venule

• Lymphatic vessel

• Artery of muscular type

• Muscle type vein

The wall of the venule is formed by shells:

• Inner of endothelium, outer connective tissue.

• Inner of mesothelium, outer connective tissue;

• Inner of fibroblasts, outer  muscle;

• Inner of pericytes, outer muscle;