Blood vessels ( Lab midterm)

Question 1

three layers of blood vessel wall; innermost to outermost

Answer 1

1.tunica intima
2.tunica media
3.tunica externa

Question 2

blood vessel wall layer composed of simple squamous epithelium (endothelium); reduces friction

Answer 2

tunica intima

Question 3

blood vessel wall layer composed of mostly smooth muscle and elastic fibers; vasoconstriction and vasodilation

Answer 3

tunica media

Question 4

blood vessel wall layer composed of loose collagen fibers; protects and reinforces the wall & anchors vessels surrounding structures

Answer 4

tunica externa

Question 5

Tiny blood vessels associated with the tunica externa that provides nutrients to the outer layer

Answer 5

Vaso vasorum

Question 6

smallest arteries that lead to capillaries in a capillary bed

Answer 6

Arterioles (resistance arteries)

Question 7

arteriole branch that branches into 10-20 capillaries forming a capillary bed

Answer 7

Terminal arterioles

Question 8

microscopic blood vessels; exchanges gases, nutrients, waste, hormones, etc. Between blood and interstitial fluid and surrounding tissues

Answer 8

Capillaries [exchange vessels]

Question 9

interwoven network of capillaries, located between arterioles and venules

Answer 9

Capillary beds

Question 10

smallest veins that capillaries in a capillary bed drain into

Answer 10

Postcapillary venule

Question 11

eventually become veins, takes blood away from the capillary bed

Answer 11

Venule

Question 12

an arterial anastomosis at the base of the brain; encircles the pituitary gland and optic chiasma and unites the brains anterior and posterior blood supplies

-also equalizes blood pressure in the two brain areas and provides alternate routes for blood to reach the brain tissue if blocked

Answer 12

Cerebral arterial circle [circle of Willis]

Question 13

a large artery that carries deoxygenated blood from the right ventricle of the heart towards the lung

Answer 13

Pulmonary trunk

Question 14

first portion of the aorta; runs posteriorly and to the right of the pulmonary trunk

Answer 14

Ascending aorta