Circulatory System PART ONE. Platelet White blood cells Red blood cells.
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Transcript of Circulatory System PART ONE. Platelet White blood cells Red blood cells.
Circulatory System
PART ONE
Platelet
White blood cells
Red blood cells
The 4 Components of Blood
Red Blood Cells - Cells that carry oxygen molecules- They contain hemoglobin- Does not have a nucleus- 120 day lifespan
White Blood Cells
- Immune cells that attack and engulf pathogens- Uses the circulatory system for transportation to sites of injury
Platelets - Cellular elements that initiate the blood clotting process- They clump together to create a “plug” to prevent further blood loss
Plasma - A pale-yellow liquid - The majority of the liquid is water, the rest is: proteins, glucose, minerals, CO2 and hormones
#1
Purpose & Function of the Circulatory System
1. To transport oxygen and nutrients to the body’s cells.
2. To transport carbon dioxide and wastes away from the body’s cells.
3. To provide a transportation system for our immune system cells.
4. To distribute heat throughout the body.
#2
Blood Vessels#3
Artery Vein Capillary
Blood VesselsArtery Capillary Vein
Function Carries blood away from the heart at high pressure
Site of gas and nutrient diffusion
Returns blood to the heart at low pressure
Structure of Wall Thick, muscular, elastic wall
Thinnest walls, one cell thick
Thin wall, less muscular
Size of Opening Narrow Very Narrow Wide
Valve? No No Yes
How does structure meet it’s function?
Strength and elasticity needed to withstand the pulsing of the blood, prevents bursting
No need for strong walls, as most of the blood pressure has been lost, thin walls allow for diffusion of materials between the vessel and body cells
No need for strong walls, as most of the blood pressure has been lost, valves prevents backflow of blood
#3
Valves in Veins Prevents Backflow of Blood
Aorta
Superior Vena Cava
Right Atrium
Inferior Vena Cava
Tricuspid Valve
Right Ventricle
Pulmonary Artery
Left Atrium
Pulmonary Veins
Mitral Valve
Left Ventricle
Pulmonary Valve
Aortic Valve
#4
http://www.youtube.com/watch?v=-s5iCoCaofc
Aorta
Superior Vena Cava
Right Atrium
Inferior Vena Cava
Tricuspid Valve
Right Ventricle
Pulmonary Artery
Left Atrium
Pulmonary Veins
Mitral Valve
Left Ventricle
Pulmonary ValveAortic Valve
Veins
Arteries
#5
Right Lung
Left Lung