Blood Vessels

Question 1

Tunica Externa

Answer 1

Outermost and Connective Tissue

Question 2

Tunica Media

Answer 2

Middle Layer and Smooth Muscle

Question 3

Tunica Intima

Answer 3

Innermost the Endothelium
Single layer of cells

Question 4

Elastic Arteries

Answer 4

Our large arteries
Lots of elastin to allow for extension
Maintain forward flow

Question 5

Arterioles

Answer 5

Smaller but bigger surface areas (Lots more)
Main resistance vessels (Have more smooth muscle)
Dilation and constriction of these have a greater affect on blood pressure

Question 6

Muscular arterioles

Answer 6

Main determiner of overall blood pressure
because of mass of smooth muscle
Steadies the blood flow

Question 7

Capillary

Answer 7

Only tunica intimacy
allows for diffusion (delivers O2 to tissues)
Flushing helps with the diffusion

Question 8

Venules

Answer 8

Drain fluid out of capillaries
Have all three tunica layers but smaller
low pressure

Question 9

Valves

Answer 9

Made of tunica intima and prevent back flow

Question 10

Elastic arterioles

Answer 10

Expands to steady flow

Question 11

Resistance

Answer 11

Impairs the flow

Question 12

3 Factors that affect resistance

Answer 12

viscosity, vessel radius (most important), vessel length

Question 13

What happens when resistance increases

Answer 13

Blood pressure increases

Question 14

Pulse pressure

Answer 14

systolic - diastolic

Question 15

mean arterial pressure

Answer 15

pulse pressure/3 + diastolic pressure