Download Cardiovascular-System-Part

Cardiovascular System
Part 2
Paths of Circulation
• Pulmonary Circuit
– Arteries carry blood from right ventricle to the
– Alveolar capillaries in the lungs and
• Alveolar capillaries exert less pressure than normal
capillaries
– Veins that lead back to the left atrium
Paths of Circulation
• Systemic Circuit
– Left ventricle to all parts of the body (including the
heart)
– Vessels leading back to the heart
– Includes aorta
Arterial System
• Ascending aorta
– Contains right and left coronary arteries
– Branches of the aortic arch:
• Brachiocephalic
• Left common corotid
• Left subclavian arteries
Venous System
• Veins return blood back to the heart
• Large veins parallel the paths of major arteries
• The median cubital vein
– Often used as site for venipuncture
• The jugular vein drains:
– Brain, neck, and head
Venous System of the Abdominal
Viscera
• The blood in the hepatic portal system is rich
in nutrients.
• The blood from the abdominal viscera
generally enters the hepatic portal system and
is carried to the liver.
• Liver helps regulate blood concentrations of
glucose, amino acids, and lipids.
Life-Span Changes
• Plaque build-up may begin early
• Heart rate and output decline slightly with age
• Blood pressure increases with age, while
resting heart rate decreases with age
• Moderate exercise correlates to lower risk of
heart disease in older people.