Blood Vessles Pt. 1

Question 1

Blood vessels?

Answer 1

Delivery system of dynamic structures that begins and ends at the heart.

Question 2

Arteries?

Answer 2

Carry blood away from the heart; oxygenated except for pulmonary circulation and umbilical vessels of fetus

Question 3

Veins?

Answer 3

Carry blood toward heart; deoxygenated except for pulmonary circulation and umbilical vessels of fetus

Question 4

Walls of vessels consist of what layers? (arteries and veins only)

Answer 4

1. Tunica Intima
   2.Tunica Media
2. Tunica externa

Question 5

Capillaries layer

Answer 5

Endothelium with sparse basal lamina

Question 6

1. Tunica Intima
   2.Tunica Media
2. Tunica externa
   (Made out of ?)

Answer 6

1. simple squamos
   2.smooth muscle
   3.elastic (loose CT) and collagen fiber

Question 7

Arteries divide into three groups based on size and function. What 3 types?

Answer 7

1. Elastic arteries
   2.Muscular arteries
   3.Arterioles

Question 8

Elastic Arteries are?

Answer 8

-Conducting arteries
-have a large diameter
-function as pressure reservoirs

Question 9

Muscular Arteries are?

Answer 9

-Distributing arteries
-Distribute blood to various parts of the body

Question 10

When do Elastic aorta and arteries stretch?

Answer 10

During ventricular contraction.

Question 11

When do Elastic aorta and arteries recoil?

Answer 11

During ventricular relaxation.

Question 12

Arterioles?

Answer 12

Smallest of all arteries that control flow into capillary beds via vasodilation and vasoconstriction of smooth muscle, therefore lead to capillary beds.

Question 13

Capillaries?

Answer 13

are microscopic vessels, that only single RBC can pass through at a time.

Question 14

Capillaries function?

Answer 14

Function: exchange of gases, nutrients, wastes, hormones; between blood and interstitial fluid.

Question 15

Types of Capillaries?

Answer 15

1.continous
2.fenestrated
3.sinusoid

Question 16

Type of Capillaries: Continuous

Answer 16

-Abundant in skin, muscle, lungs and CNS. formed by endothelial cells.

Question 17

Types of Capillaries: Fenestrated

Answer 17

-Found in areas involved in active filtration like kidneys, absorption like intestines, or endocrine hormone secretion.
-Covered by fenestrated capillary that looks like Swiss cheese.

Question 18

Types of Capillaries: Sinusoid

Answer 18

-Fewer tight junctions; usually fenestrated with larger intercellular clefts; incomplete basement membranes
-Found only in the liver, bone marrow, spleen, and adrenal medulla

Question 19

Capillary bed

Answer 19

interwoven network of capillaries between arterioles and venules

Question 20

Microcirculation

Answer 20

Flow of blood through bed from arteriole to venule

Question 21

Terminal arteriole

Answer 21

branch off arteriole that further branches into 10 to 20 capillaries (exchange vessels) that for capillary bed

Question 22

Capillaries drain into ________?

Answer 22

Postcapillary venule

Question 23

______ conditions and _________ vasomotor nerve fibers regulate amount of blood entering capillary bed.

Answer 23

1. Chemical
   2.Arteriole

Question 24

Capillary Bed in order

Answer 24

1. Arteriole
   2.Terminal Arteriole
   3.Capillaries
   4.Postcapillary venule
   5.Venule

Question 25

Venules merge into?

Answer 25

Veins

Question 26

Venous valves

Answer 26

-Prevent backflow of blood -Most abundant in veins of limbs

Question 27

Venous Sinuses

Answer 27

-Flattened veins with very thin walls EX: coronary sinus

Question 28

Varicose veins

Answer 28

dilated and painful veins due to incompetent leaky valves caused: obesity, prolonged standing in one position, or elevated venous pressure

Question 29

Systemic veins

Answer 29

-Supply all (60%) of the body except the lungs -Contain a large proportion of the blood volume so they're called capacitance vessels or blood reservoirs