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The Cardiovascular System: Circulation & Heart
Transcript of The Cardiovascular System: Circulation & Heart
by Joel David Hutson
College of Lake County
Main Point #1 & Objective #1:
Closed circulatory systems like that of a human's have a pulmonary & a systemic circuit. Be able to compare & contrast the different paths of these circuits and their functions.
Main Point #2 & Objective #2:
Capillaries are the primary site of diffusion in blood vessels. Evaluate how diffusion occurs both from capillaries & into them, using a general knowledge of hydrostatic (blood) pressure & osmotic pressure.
Diffusion: the evolution of circulatory systems in animals or plants
As any organism gets larger (maintaining the same proportions) the need for a circulatory system coupled with a respiratory system increases, since the increase in surface area does not keep up with the increase in volume.
Therefore, circulatory Systems evolve in most organisms as they get larger to help move materials
around the body, & inside & out of it, because their volume is just to big for diffusion to work.
An Open Circulatory System
common in many invertebrates:
slow flow because the pressure
is very low outside of vessels
Closed circulatory systems are capable of greater pressures when fluids remain confined to limited spaces.
Pressure is high = faster blood flow. Valves prevent the backflow of blood within the blood vessels.
Heart A & P
formed of circles
Course Learning Objectives & Outcomes:
C. Describe the basic ways that materials move within & between cells.
M. Identify the major structural components of the cardiovascular & lymphatic systems (including blood & lymph) & describe their functions.
The human heart is adapted to keep oxygenated & deoxygenated (i.e., full of carbon dioxide) blood separate. For the exam be able to justify why this adaptation makes our circulatory systems very efficient, using what you know about diffusion & the A & P of the pulmonary & systemic circuits.
Demonstrate, using examples from areas of the body, why anastomoses are protective adaptations in your circulatory system.