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