Circulation: Getting from

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Presentation transcript:

Circulation: Getting from here to There

Introduction to the Circulatory System As a life function  system TRANSPORT Immune factors nutrients hormones O2/CO2 wastes

A CLOSED circulatory system has 3 basic parts 1. A pump 3. Something to pump (Heart) 2. Some tubes (blood Vessels) There will be… (Blood)

An OPEN circulatory system …is missing one of those components.

These are a little more reasonable…

Open vs. Closed (circulation)

Circulatory Plumbing Blood Vessels No beginning or end, so since we have to start somewhere…

Arteries Carry blood AWAY from heart Thick, elastic, muscular walls Have a pulse Gradually become smaller as they get farther away from the heart until they become arterioles

Body cells Environment Capillaries Tiny, tiny, tiny (only a few blood cells at a time) Very thin walls  “leaky” Exchange of material Blood Body cells Environment

Capillaries Plasma portion of blood is “squeezed out” Becomes “Intercellular fluid” Some reenters capillaries, a lot is collected by lymphatic system

Veins Blood TO heart Thinner walls (than arteries) Have valves for one-way flow No pulse

The LYMPHATIC System The tubes you never hear about Have their own capillaries and veins Collect intercellular fluid in their capillaries ICF returned to circulatory veins by the Lymphatic veins

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