Week 8 Principles of vessels veins and lymphatics

Question 1

functions of veins

Answer 1

• return blood to heart
  –> from limbs, gut via liver
  –> deoxygenated
• store majority of blood

Question 2

three venous system

Answer 2

1. systemic venous system
   –> transports deoxygenated blood towards heart
2. pulmonary venous system (lung to heart)
   –> transports oxygenated blood towards heart
3. portal venous system (gut to the liver)

Question 3

function of venous valves

Answer 3

permit unidirectional flow

Question 4

what is venous sinuses

Answer 4

normal dilatation of veins within surrounding tissue

静脉窦；湾；下陷或凹下去的地方

Question 5

what is the function of lymphatic system

Answer 5

provide defense

Question 6

what is deep vein thrombosis (DVT)

Answer 6

• pooling of blood in soleal venous sinuses
• thrombus (clot) may form

日復一日長時間久坐或久臥不動，此正正是深層靜脈栓塞的病因。此病源於血液經下肢（即大腿和小腿）的大靜脈系統回流心臟途中流動變得緩慢，繼而結成血塊（血栓）並阻塞靜脈血管回流。