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Key Concepts : 2. Pulmonary Circuit: From the Right Heart to the Lungs Systemic Circuit: From the Left Heart to Everywhere Else 65 -70% in veins(= blood reservoir); lumen is larger than in corresponding arteries 30-35% in heart, arteries and capillaries N.B. The chambers pump the same VOLUME 3.
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capillaries large vein medium-sized vein venules Arteries ALWAYS carry blood away from heartVeins ALWAYS return blood to heart,contain about 2/3 body's blood at any given time 6. Pulmonary trunk & aorta and their major branches Superior & inferior vena cava and their tributaries Largest, conducting arteries lead directly from heart, subject to high pressures 7. External and internalcarotids, brachial &femoral arteries External and internal jugular, brachial &femoral veins 2 - 9 mm ~ 4 mm 8. ~ 10-50 m ~ 30 mRemember:RBC ~ 7 m 9.
Fig 19.3 10.
Fig 19.3 11. CapillariesIntestinal mucosa, choroid plexus, endocrine glands,kidneysMost body regions Only endothelium Variably permeablesomewhat permeableCharacterized by circular fenestrations or pores that penetrate the endothelium -permit exchange of larger molecules. ~ 8 m 12.
A lymphocyte traversing a fenestrated sinusoid. 13.
Portal Systems 14. Postcapillary venule Venule Vein Thin wall Large lumen Low pressure Low velocity Valves 15. Why are valves found in veins but not in arteries? 16. Pulmonary &Systemic Circulations 17. Right ventricle into pulmonary trunk to pulmonary arteries to lungs Return by way of 4 pulmonary veins to left atrium 18. Left common carotid 2 Systemic Circulation Brachiocephalic trunk 1 Left subclavian 3 19. Right Common Carotid Brachiocephalic Trunk Left Common Carotid Left Subclavian Right Subclavian 20.
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22. Arteriovenous malformations (AVM) are masses of abnormal blood vessels which grow in the brain. 23. 24. Dynamic angio 25.
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Ulnar Artery Superficial Palmar Arch 28. Descending aorta Thoracic aorta Abdominal aorta Abdominalaorta Commoniliac Externaliliac Femoral 29.
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See Fig. 19.22 Median cubital v. 35.
36. Portal vein 37.
38. Figure 19.26 During fetal life, all oxygen and nutrition comes not from the intestine and lungs, but from the placenta. The fetus has different circulatory pathways to accommodate these different needs. These pathways must change AT the time of birth. 39.
40. Patent foramen ovale 41. Cerebral aneurysmsMost common type: berry aneurysm Usually occur at the bifurcations and branches of the large arteries located at the Circle of WillisAbdominal Aortic Aneurysm Repair 42.