The Blood - PowerPoint PPT Presentation

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The Blood

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The Blood How many litres of blood do you have in your body? 4-6 L Blood has four main components Plasma Red blood cells White blood cells Platelets – PowerPoint PPT presentation

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Title: The Blood


1
The Blood
  • How many litres of blood do you have in your
    body?
  • 4-6 L
  • Blood has four main components
  • Plasma
  • Red blood cells
  • White blood cells
  • Platelets

2
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3
Plasma (55)
  • Straw coloured solution containing
  • Water with dissolved salts (90)
  • Plasma proteins (10)
  • Nutrients, metabolic wastes, hormones, O2, CO2
  • Plasma proteins help transport vitamins and fight
    viral and bacterial infections

4
Red Blood Cells (41)
  • Carry oxygen (hemoglobin)
  • Produced in bone marrow (2 million/second)
  • No nuclei
  • Life span of 100 days
  • Gives them a flat disk shape
  • Increased surface area for O2 molecules
  • Flexibility to squeeze through different sized
    blood vessels

5
Sickle Cell Anemia
6
White Blood Cells (3)
  • Fight infection, parasites, and bacteria
  • Can move through blood vessel walls
  • Your WBC count increases when you have an
    infection
  • Pus is WBCs and dead bacteria
  • Produced in the bone marrow
  • Life span of years

7
Platelets (1)
  • Help with blood clotting
  • Release clotting factors
  • Scab forms

8
Blood Type
9
Blood Vessels
  • Arteries
  • Capillaries
  • Veins

10
  • Arteries
  • Carry blood away from the heart to the body
    tissues
  • Smaller diameter
  • High pressure
  • Capillaries
  • Exchange of nutrients and wastes (diffusion
    gradient)
  • Tiny tubes with large surface area
  • Veins
  • Carry blood back to the heart
  • Larger diameter
  • Low pressure
  • Valves allow blood to only flow in one direction

11
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