Blood Vessels

Question 1

Vein

Answer 1

Bring blood to the Heart
Thin, inelastic walls
Carries blood at low pressure
Allows blood to drain back to heart
Valves- prevent backflow 
Varicas vein can develop- not elastic

Question 2

Capillary

Answer 2

Tiny 1 cell thick
Network around each cell
Carry blood between cells
Easy diffusion
Fast/ more efficient exchange of nutrients and waste
Allow all cells to exchange waste and nutrients

Question 3

Artery

Answer 3

Carry blood away from Heart
Thick muscular and elastic wall- expands and cater for pumping of blood
High pressure
Makes sure arteries don’t explode
Elastic wall- allow arteries to recoil to size
Blood gets to body quicker- fast delivery

Question 4

Valves

Answer 4

Prevent backflow

Allow blood to flow in one direction

Question 5

Tendinous Chord

Answer 5

Pull on valves to stop them from turning inside out
Connects valve to papillary muscle in wall of heart
Papillary muscle contracts- pulling tendinitis chord and therefore opening valve to allow blood to flow

Question 6

Differences between artery and vein (5)

Answer 6

A- carries blood away from heart
V- carries blood to the heart
A-blood pressure increased when ventricles contract 
V- blood pressure is constant and low
A- thick, muscular, elastic wall
V- thin, inelastic, Non muscular wall
A- no valves
V- valves
A- oxygenated blood
V- deoxygenated blood

Question 7

Changes of blood vessels

Answer 7

Artery-> arteriole -> capillary-> venule-> vein

——-oxygenated—— —deoxygenated—