Blood Vessels Flashcards
____ carry blood toward the heart.
Veins.
____ are the smallest blood vessels, through the walls of which gases and nutrients are exchanged with tissues.
Capillaries.
____ are the walls of blood vessels, while ____ is the central space through which blood flows.
Tunics;
The lumen.
The innermost wall of the blood vessels is called the ____ or ____.
Tunica interna;
Tunica intima
____ carry blood away from the heart.
Arteries
The tunica intima consists of ____, which is surrounded, in larger vessels, by a thin layer of connective tissue.
Simple squamous epithelium (OR endothelium)
____ is the middle tunic of blood vessels, and primarily consists of a mixture of ____ and ____.
Tunica media;
Smooth muscle;
Elastin.
The ____ (also called ____) refers to the outermost layer of the blood vessel wall.
Tunica externa;
Tunica adventitia.
Larger blood vessels are anchored to the surrounding tissue by their outermost layer, which is composed mostly of ____.
Loosely woven collagen fibers.
In larger vessels, the outermost layer is too far from the blood it carries to exchange gases or chemicals, and so they have their own blood supply: the ____.
Vasa vasorum.
Nerve fibers,lymphatic vessels, and in large veins, elastin fibers are found in the ____ of the blood vessels.
Tunica externa OR tunica adventitia.
Arteries are classified into three types: ____, ____ and ____.
Elastic artery;
Muscular artery;
Arteriole.
Veins are classified into two types: ____ and ____.
Venule;
Vein.
____ connect arterioles to venules.
Capillaries.
____ arteries are thick-walled arteries nearest the heart, and functions as shock-absorbers to minimize the difference between ____ and ____ blood pressure.
Elastic;
Systolic;
Diastolic.
Elastic arteries are sometimes referred to as ____.
Conducting arteries.
Muscular arteries have more ____ and less ____ than elastic arteries.
Smooth muscle;
Elastic tissue.
The purpose of muscular arteries is to ____.
Distribute blood.
Another name for muscular arteries is ____.
Distributing arteries.
____, also called ____, are the smallest arteries.
Arterioles;
Resistance vessels.
____ refers to the narrowing of the lumen of blood vessels due to contraction of smooth muscles in the blood vessel walls, while ____ refers to the widening of the lumen due to their relaxation.
Vasoconstriction;
Vasodilation.
Capillaries are so small that in some cases a(n) ____ spans the entire circumference of the capillary wall, and RBCs must ____ to travel though.
Single cell;
Deform slightly.
In general, nutrient and waste exchange and gas exchange occurs by ____, but there are exceptions.
Diffusion across capillary walls.
(True or false)
Cartilage and epithelia receive their nutrients from an extensive capillary bed.
FALSE
Cartilage and epithelia have no capillaries.
