Blood Vessels

Question 1

Blood Vessels - 3 types

Answer 1

1. Arteries
2. Veins
3. Capillaries

Question 2

1. Arteries

Answer 2

Thick muscular walls
Small lumen (tiny hole)
Small passageway for blood
Contains blood under high pressure

Question 3

2. Veins

Answer 3

Thin / narrow walls
Large lumen ( bigger hole)
Large passageway for blood
Contains blood under low pressure
Have valves to prevent blood flowing backwards
Valves are needed in the veins because the blood flows at low pressure (speed) the blood could easily move backwards

Question 4

3. Capillaries

Answer 4

Microscopic – 1 cell thick ( very thin)
Allows blood to pass through one cell at a time
Found in the muscle / lungs
Contains blood under very low pressure
Semipermeable membrane allowing gas / nutrients in and out of the blood
Where gas exchange occurs
- oxygen travels from the capillary walls into the tissues
- carbon dioxide travels into the capillary wall from the tissues

Question 5

Lumen

Answer 5

the inside space of tubular structure (blood vessels / intestines)

Question 6

Semipermeable

Answer 6

allowing certain substances to pass through but not others

Question 7

Arteriole

Answer 7

Small artery

Question 8

Venule

Answer 8

Small vein

Question 9

Blood travelling through the capillaries

Answer 9

Vein- Venule - Capillaries- Arteriole- Artery

Question 10

Tunica Intima

Answer 10

The 1st layer of the blood vessel
Intima – think intimate
The inner coating of the blood vessel

Question 11

Tunica Media

Answer 11

The 2nd layer of the blood vessel

Media – think middle

Question 12

Tunica Externa

Answer 12

The 3rd layer of the blood vessel
Externa – think external

The last coating of the blood vessel

Question 13

Tunica

Answer 13

Tunica – think about tunic a covering of something