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Are coronary arteries elastic?
Yes, arteries have elastic lamina.
An elastic lamina on both sides of the tunica media is a characteristic of what?
An elastic artery, e.g. aorta
What are the characteristics of elastic arteries?
The tunica interna of an elastic artery has subendothelial laminas of elastic fibres. Its tunica media has many fenestrated elastic membranes alternating with smooth muscle fibres. An elastic artery also has external elastic lamina. Its tunica externa is thin and contains vasa vasorum.
What is the structure that divides thalamus into three main parts?
Internal medullary lamina
What is the middle muscle layer in a blood vessel called?
The three layers of the arterial wall are, from outside to inside, the adventia, the media and the intima. A flat layer of cells, called endothelial cells, forms a boundary between the blood in the lumen, or cavity, and the innermost layer of the arterial wall. Its called tunica intima "The tunica media is the middle layer in a blood vessel wall and is composed predominantly of smooth muscle reinforced by organised layers of elastic tissue which form elastic laminae. The tunica media is particularly prominent in arteries, being relatively indistinct in veins and virtually non-existent in very small vessels. The tunica media also contains autonomic nerves. In vessels which are close to the heart, receiving the full thrust of the systolic pressure wave, elastic tissue is very well developed, hence the term elastic arteries. In muscular arteries and arterioles the prominent elastic lamina just below the tunica intima is termed the internal elastic lamina."http://greenfield.fortunecity.com/rattler/46/comparison_of_types_of_vessels.htm
Name the major veins that empty into the innominate veins?
internal jugular and subclavian veins
Which of the following is a difference between arteries and veins?
artery walls have more elastic tissue and smooth muscle than veins,
What are the three different types of vessels?
arteries thick walled and elastic blood vessels capillaries and veins
How is junctional epithelium attached to enamel?
The junctional epithelium attaches to enamel by means of internal basal lamina .
Why do veins have less collagen elastic fibers and smooth muscles than arteries?
Because blood in veins is under lower pressure than in arteries, so they do not need as many collagen fibres. In addition, as veins already have a wide diameter, they do not need to dilate that much hence they also dont contract that much (as opposed to artieries), so they have less elastic recoil, thus they have less elastic fibres. :)
What are the characteristics of a muscular vein?
The tunica interna of a muscular vein consists of an endothelium with a basal lamina, a thin subendothelial layer with smooth muscle cells, and a thin internal elastic membrane. Its tunica media has several layers of circularly arranged smooth muscle cells dispersed with collagen and elastic fibres. The smooth muscle cells may be arranged longitudinally in its tunica media. Its externa is generally thicker than its tunica media and has collagen fibres and a network of elastic fibres.
The area between the tip and the bottom of the leaf blade is called?
The surface area between the tip and the bottom of a leaf is called the lamina. The lamina is attached to the plant stem by the petiole. The lamina is supported by veins, which carry nutrients to the leaf tissue.
