Venous System

Question 1

What are the 2 types of venules

Answer 1

1. Post capillary

2. Muscular

Question 2

True of False post capillary venules can exchange nutrients and wastes

Answer 2

True, only other place this happens besides capillaries

Question 3

Define diapedesis

Answer 3

the process where WBCs pass through pores in the venules to inflamed/infected tissue

Question 4

What differentiates post capillary and muscular capillaries

Answer 4

post capillary venules gain 1-2 layers of smooth muscle as they move away from the capillary becoming muscular venules.

Question 5

True or False post-capillary and muscular venules are the most distensible elements of the entire vascular system

Answer 5

True, they are reservoirs for large amounts or blood

Question 6

What are the characteristics of veins

Answer 6

• Low pressure vessels that lack internal and external elastic laminae and have thin layers of smooth muscle
• Distensible and high capacitance

Question 7

Describe a lacerated vein

Answer 7

oozing blood

Question 8

Why do veins have valves.

Answer 8

Aid in venous return by helping prevent excessive backflow and pooling

Question 9

What are venous valves made from.

Answer 9

They are thin folds of the tunica interna (intima) and connective tissues

-similar to semilunar valves

Question 10

What is a vascular sinus

Answer 10

• A vein w/ a very thin vascular wall, lacking smooth muscle

- dense connective tissues replaces the tunica media and tunica externa to provide support

Question 11

Superficial veins

Answer 11

veins that lie within the subcutaneous layer of the skin

Question 12

Deep veins

Answer 12

veins that lay deep between the musculature

Question 13

Perforating veins

Answer 13

veins that connect deep and superficial veins, have one way valves (superficial to deep)

Question 14

Compare/contrast superficial and deep veins of the upper and lower limbs

Answer 14

Upper limbs= superficial veins larger than deep veins

Lower limbs= deep veins larger than superficial, deep veins also serve as primary pathway to the heart (helps fight gravity better)

Question 15

What are varicose veins

Answer 15

• Leaky venous valves (defect from congenital issue or mechanical stress or aging) cause veins to become dilated, twisted, and possibly inflamed
• common locations=esophagus, anus, superficial veins of lower limbs
• occurs more in superficial b/c musculature helps stop pooling

Question 16

How are varicose veins treated

Answer 16

• Elastic stockings
• sclerotherapy
• laser occlusion
• stripping