Ap2 chapter 19 cardiovascular
Blood vessels called ———-connect arterioles to venules.
Capillaries
Which blood vessels have an extremely thin wall and narrow vessel diameter that are optimal for the diffusion of gases and nutrients?
Capillaries
Capillaries function together by forming a__________
Capillary bed
Which type of capllaries use simple diffusion or plnocytosis to pass materials through the vessel walls?
Continuous capillaries
Which arteries are also called conducting arteries because they conduct blood away from the heart to the smaller muscular arteries?
Elastic arterles
Which type of artery has a large proportion of elastic fibers throughout all three tunics, especially the tunica media?
Elastic artery
Which arteries provide only one pathway through which blood can reach an organ?
End arteries
The__________elastic lamina In the walls of muscular arterles separates the tunica medla from the tunica extema.
External
True or false: Arterles contain valves to prevent the backflow of blood.
False
In the figure, a __________capillary is shown.
Fenestrated
Which type of capilaries have pores within each endothellal cell and a continuous basement membrane?
Fenestrated caplaries
Which are components of a capillary bed?
Metarteriole
Smaller and medium-sized veins typically travel with.——-
Muscular arteries
Which arteries are also known as distributing arteries because they distribute blood to the body organs and tissues?
Muscular arteries
Which arterles have a greater amount of smooth muscle in their walls to enable better vasoconstriction and vasodilation?
Muscular artery
In a ____________blood passes through two capillary beds before returning to the heart.
Portal vein
Relaxation of the _______________allows blood flow Into the true capllaries of a capillary bed.
Precapillary sphincter
The narrow diameter of capillaries means that erythrocytes must travel single file. This is termed___________
Rouleau
What type of capillary is shown in the figure?
Sinusoid
The large gaps and discontinuous or absent basement membrane of _________allow this type of caplary to transport larger materlals such as proteins or cells. .
Sinusoids
In a capillary bed, the distal part of the metarteriole, called the ____________connects to a postcapillary venule.
Throughfare channel
True or false: Blood transported to and from the spleen is an example of a simple blood flow pathway.
True
The walls of capillaries contain only the ___________Intima allowing for rapid gas and nutrient exchange between the blood and tissues.
Tunica
What layer of the blood vessel wall is composed of an endothelium and a subendothellal layer of areolar connective tissue?
Tunica intima
What layer of the blood vessel wall is composed of circularly arranged layers of smooth muscle cells?
Tunica media
The network of small arteries extending through the tunica externa of very large blood vessels is know as the
Vasa vasorum
The narrowing of the blood vessel lumen resulting from contraction of the smooth muscle of tunica media is known as
Vasoconstriction
Smooth muscle in the arterioles usually is at least slightly constricted. This slightly constricted state is called_________tone.
Vasomotor
Which class of blood vessel returns blood to the heart?
Veins
Which blood vessels become larger and merge as they move toward the heart? Click the answer you think Is right.
Velns
A___________anastomosis includes two or more veins draining the same body region.
Venous
The companion vessels to the arterioles are the
Venules
Two or more arteries converging to provide alternate blood supply routes to body tissues or organs are called.
anastomoses
The smallest type of arteries are the———
arterioles
In the body, ———blood vessels travel together and supply the same region.
companion
The aorta, pulmonary arteries, brachiocephalic arteries, and common illiac arteries are examples of_______
elastic arteries
Arteriole vasodilation____________blood flow into an area.
increases
The space within a vessel through which blood flows is the.
lumen
Most of the named arterles of the body, such as the brachlal, anterior tibial, coronary and inferior mesenteric arteries, that distribute blood to body organs and tissues are examples of_________.
muscular arteries
In a capillary bed, the thoroughfare channel connects to a___________
postcaplllary venule
The bulk of a capillary bed is formed by the____________.
true capillaries
The outermost layer of a blood vessel is known as the————
tunica externa
Where are sinusolds found within the body?
1.Bone marrow 2.Liver 3.Spleen
Which are muscular arteries?
1.Coronary artery 2.Inferior mesenteric artery 3.Brachial artery
Where are continuous capillaries found within the body?
1.Muscle 2.Skin
Which processes are involved in vasomotion?
1.Precapillary sphincters open when a tissue needs nutrients. 2.Precapillary sphincters close when a tissue's needs are met.
Which are types of capillaries?
1.Sinusoids 2.Continuous 3.Fenestrated
Where are fenestrated caplaries found within the body?
1.Small intestine 2.Kidney
Which characteristics describe the general structure of a vein?
1.Walls collapse when drained of blood 2.Wider lumen than companion artery 3.Thicker tunica externa
When a person is at rest, approximately how much blood is being held within the veins, the body's blood reservoirs?
55%
Match the letter on the left with the structure on the right. General vessels structure
A. Lumen, B. Valve, C. Tunica external, D. Capillary bed
Identify the layers of the blood vessels on the figure. Vessels structure
A. Tunica intima B. Tunica media C.Tunica externa
A(n) ___________supply the same body reglon. Is the site where two or more arterles (or two or more velns) converge to
Anastomosis
Which are major classes of blood vessels?
Arteries , capillaries, Veins
A(n) ______________or shunt, transports blood from an artery directly Into a vein, bypassing the capllary bed.
Arteriovenous anastomosis
Which are muscular arteries?
1. Inferior mesenteric artery 2. Brachial artery 3. Coronary artery
