Why do veins collapse during blood?

Related questions

1. What is considered the most suitable vein for taking blood?
2. Which arm has the main artery?
3. Are there veins in your armpits?
4. What is the treatment for subclavian steal syndrome?
5. Why is subclavian steal syndrome more common on the left?
6. Where does the subclavian artery become the axillary?
7. What causes hematomas during phlebotomy?
8. What is a subclavian steal?
9. Can you draw blood from any vein?
10. How do you know if you hit a nerve?

Tags

1. #irritation
2. #particularly
3. #abuse
4. #blocked
5. #common
6. #context
7. #conditions
8. #caused
9. #temporarily
10. #injecting
11. #ideal
12. #substance
13. #veins
14. #where
15. #response
16. #injected
17. #plasma
18. #internal
19. #become
20. #repeated
21. #swells
22. #needle
23. #injury
24. #lining
25. #donating