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10 Cards in this Set
- Front
- Back
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Circulatory System
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Transports O in, Co out, nutrients, wastes products, immune cells, and signaling molecules throughout the body and heats the body
CV disease- 40% of all deaths (900,000 annually) |
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Open Circulatory System
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Circulatory fluid comes in direct contact with tissues in spaces called sinuses.
Circulating fluid mixes with interstitial fluid |
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Closed Circulatory System
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Circulatory fluid remains within vessels and does not come in direct contact with the tissue
Circulating fluid is distinct from interstitial fluid Molecules must diffuse across vessel wall (capillary) First in jawed vertebrates, cephalopods, and annelids |
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Bulk Flow
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flows only in one direction according to the opening and closing of valves.
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Blood Flow
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Away from the heart in arteries which branch to smaller arteries that then branch to arterioles within tissue then into capillaries.
The capillaries then form venules, which form veins, which brings blood flow back to the heart. *Venules have one way valves in them GREAT PICTURE IN SLIDES |
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Morphologic Differences in Heart
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Right wall thinner b/c blood doesn't have to be pumped as hard
Left wall is thicker b/c blood needs to travel fairly long distances |
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Systemic and Venous Circulation
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(Birds and mammals)
Four chambered heart -2 atria -2 ventricles Systematic vs Pulmonary circuits are divided -pressure can be different in 2 circuits -high pressure systemic -low pressure pulmonary Oxygenated and deoxygenated blood are completely separate |
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cardiac Cycle
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Pumping action of heart
Systolic -contraction -blood forced out into circulation Diastolic -relaxation -blood enters heart EG systolic/diastolic |
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Valves
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Atrioventricular (AV) valves
-between atria and ventricles -tricuspid on right -bicuspid on left Semilunar valves -between ventricles and arteries -Aortic on left -Pulmonary on right |
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Vertebrate Vascular System
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Arteries
-thick, muscular walls w/ elastic fibers to withstand high pressure Capillaries -thin walled and permeable with huge surface area Veins -thin walled and highly distensible. In peripheral veins, valves that prevent back flow |
