SYSTEMIC VEIN ANATOMY & PHYSIOLOGY

1. SYSTEMIC VEIN ANATOMY & PHYSIOLOGY Nketi Forbang, MD, MPH T32 Mini Lecture, 07/13/18

2. LEARNING OBJECTIVES • By the end of this lecture, you will be able to: • Describe the basic structure and function of veins [& arteries] • Identify the three layers that make up the walls of veins [& arteries] • Understand the changes that take place as blood flows through veins [& arteries]

3. OUTLINE • Pre-Quiz • Introduction • Structure & function of veins • Wall layers (tunica) of veins • Blood flow through veins • POST-QUIZ

4. PRE-QUIZ • #1) Which of the following best describes typical veins? • A: Thick walled, small lumens, high pressure, lack valves, return blood to heart • B: Thin walled, large lumens, low pressure, have valves, return blood to heart • C: Thick walled, small lumens, high pressure, lack valves, return blood to heart • D: Thick walled, large lumens, low pressure, have valves, return blood to heart

5. PRE-QUIZ • #2) In general, compared to arteries, veins have: • A: Thicker tunica intima, thicker tunica media, thinner tunica externa • B: Thinner tunica intima, thinner tunica media, thicker tunica externa • C: Thicker tunica intima, thicker tunica media, thinner tunica externa • D: Thinner tunica intima, thinner tunica media, thicker tunica externa

6. PRE-QUIZ • #3) Under normal physiologic conditions, the largest distribution of blood flow in humans can be found in the: • A: Systemic veins • B: Systemic arteries • C: Pulmonary veins & arteries • D: Heart

7. INTRODUCTION

8. VEIN STRUCTURE & FUNCTION

9. VEIN LAYERS (TUNICA)

10. VEIN LAYERS (TUNICA)

11. VEIN LAYERS (TUNICA)

12. BLOOD FLOW • Vessels size decrease, then increase • Vessel area increases, then decreases • Blood velocity decreases, then increases • Blood pressure decreases

13. BLOOD FLOW

14. POST-QUIZ • #1) Which of the following best describes typical veins? • A: Thick walled, small lumens, high pressure, lack valves, return blood to heart • B: Thin walled, large lumens, low pressure, have valves, return blood to heart • C: Thick walled, small lumens, high pressure, lack valves, return blood to heart • D: Thick walled, large lumens, low pressure, have valves, return blood to heart

15. POST-QUIZ • #1) Which of the following best describes veins? • A: Thick walled, small lumens, high pressure, lack valves, return blood to heart • B: Thin walled, large lumens, low pressure, have valves, return blood to heart • C: Thick walled, small lumens, high pressure, lack valves, return blood to heart • D: Thick walled, large lumens, low pressure, have valves, return blood to heart

16. POST-QUIZ • #2) In general compared to arteries, veins have: • A: Thicker tunica intima, thicker tunica media, thinner tunica externa • B: Thinner tunica intima, thinner tunica media, thicker tunica externa • C: Thicker tunica intima, thicker tunica media, thinner tunica externa • D: Thinner tunica intima, thinner tunica media, thicker tunica externa

17. POST-QUIZ • #2) In general compared to arteries, veins have: • A: Thicker tunica intima, thicker tunica media, thinner tunica externa • B: Thinner tunica intima, thinner tunica media, thicker tunica externa • C: Thicker tunica intima, thicker tunica media, thinner tunica externa • D: Thinner tunica intima, thinner tunica media, thicker tunica externa

18. POST-QUIZ • #3) Under normal physiologic conditions, the largest distribution of blood flow in humans can be found in the: • A: Systemic veins • B: Systemic arteries • C: Pulmonary veins & arteries • D: Heart

19. PRE-QUIZ • #3) Under normal physiologic conditions, the largest distribution of blood flow in humans can be found in the: • A: Systemic veins • B: Systemic arteries • C: Pulmonary veins & arteries • D: Heart

20. THE END • References • https://courses.lumenlearning.com/suny-ap2/chapter/structure-and-function-of-blood-vessels/ • Google images