BIOS 100 Cardiovascular
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What does the human cardiovascular system, a fluid transport syst, consist of?
The heart, all of the body's blood vessels, the blood, and the bone marrow tissue in which red blood cell are formed.
What are the functions of the Heart and blood?
To pump blood for heart and blood is the fluid transport medium.
What substances are transported?
Oxygen, carbon dioxide, nutrients, vitamins, hormones, waste products, and immune system cells and proteins along with heat to body's core and extremities.
cardiovascular system is integral to which systems and for what?
- Respiratory System (oxygen and carbon dioxide transport)
- Digestive System (nutrient and waste product transport)
- Endocrine System (hormone transport)
- Excretory System (blood filtering)
What is the function of pulmonary circulation?
- blood circulates heart and lungs with reult that blood is oxygenated
- Also managed by right side of the heart.
What is function of systemic circulation?
- Blood circulates between the heart and rest of body
- Managed by left side of heart
what are step in pulmonary circulation?
Blood returens to heart entering right atirum.>enters right ventricle>blood is pumped from here to lungs> blood returns to left atrium from lungs
What are the steps in systemic circulation?
blood returns to left atrium from lungs>blood enters left ventricle>blood is pumped from left ventricle to body> blood returns to heart from body, enters right atrium
Heart has 4 muscular chambers:
- top two atria
- bottom two ventricles
- (right atrium and ventricle pulmonary oxigenation)
- (left atrium and ventricle systemic circulation delivery oxygented blood to body)
Which vessels carry blood away from heart:
arteries and arteioles (systemic circuit, arteries carry oxygenated blood and veins carry deoxygenated blood)
Which vessels carry blood toward heart:
- venules and veins
- ◦In the pulmonary circuit, arteries carry deoxygenated blood and veins carry oxygenated blood
What are capallaries?
The smallest vessels site of gas, thermal, molecule exchange. All action occurs here
Explain shape of vessels.
- thick, elastic, muscular walls.
- Elasticity important in maintaing blood pressure and volume
Why is inelasticity bad?
- increases blood pressure and velocity (factor for stroke, heart attacks,heart failure, aneurysms, and is a cause of chronic kidney disease).
- Also makes exchanges at capallaries less efficient
Explain function of Capillary beds.
- capillary beds feed back into the body’s system of veins that returns blood to the heart.
- Arteries near the heart branch intosmaller arterioles, which feed into the delivery vehicles of the cardiovascularsystem
When materials needed for body tissues move out of capillaries where do they go?
- into the interstitial fluid that surrounds both the capillaries and nearby cells after which the materials move into cells.
- Simulatneously having CO2 and wastes move from cells into the capillaries.
How is blood flow regulated in capillary beds?
By precapillary sphincters as wells as thoroughfare channels that allow direct flow of blood
Venules and veins are thin-walled why?
Blood pressure is zero, so flow is aided by skeletal muscles contracting to squeeze blood to heart. Contain valves to prevent backflow.
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