Chapter 20- Intro into the blood vessels

arteries are sometimes called the ________ vessels of the cardiovascular system because they have strong-resilient tissue structure.

Resistance

The outermost wall of an artery or vein is called the ______ and in large arteries and veins contains the _______.

Tunica externa; vasa vasorum

where is the greatest volume of blood found in the body?

Veins

In people who stand for long periods, blood tends to pool in the lower limbs and this may results in varicose veins. what causes the varicose veins?

failure of the venous valves

which of the following is not a possible circulatory route from the heart?

heart: arteries: capillary bed: vein: capillary bed: arteries: heart

which vessels have the thickest tunica media?

large arteries

Vasoconstriction primarily results from contraction of smooth muscle in the tunica _______?

media

what are the afferent vessels that carry blood back to the heart?

veins

What is the blood flow root starting from the heart?

Heart: conducting artery: distributing artery: arteriole: capillary: venule: medium: vein: large vein: heart

where are arterial anastomoses, in which two arteries merge, found?

In the coronary circulation

blood usually passes through one network of capillaries from the time it leaves the heart until the time it returns, but there are exceptions, notable the _______.

Portal systems and anastomoses

Alternative routes of blood supply are called?

Anastomoses

what is associated with vasomotion?

smooth muscle in the tunica media

Arteries are sometimes called the ______ vessels of the cardiovascular system because they have strong-resilient tissue structure.

resistance