blood transport and infections n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Blood, transport and infections PowerPoint Presentation
Download Presentation
Blood, transport and infections

Loading in 2 Seconds...

play fullscreen
1 / 9

Blood, transport and infections - PowerPoint PPT Presentation


  • 133 Views
  • Uploaded on

Blood, transport and infections. By Tibor Cemicky. The Composition Of Blood. Composed of: Plasma Erythrocytes (red blood cells) Leukocytes (white blood cells) Platelets . Plasma. It‘s role is to transport the following throughout the body: Nutrients Carbon Dioxide Hormones

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Blood, transport and infections' - dick


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
the composition of blood
The Composition Of Blood
  • Composed of:
    • Plasma
    • Erythrocytes (red blood cells)
    • Leukocytes (white blood cells)
    • Platelets
plasma
Plasma
  • It‘s role is to transport the following throughout the body:
    • Nutrients
    • Carbon Dioxide
    • Hormones
    • Antibodies
    • Urea
  • Plasma forms 55% of out blood
blood cells
Blood Cells
  • Red Blood Cells – transport oxygen throughout the body
  • Platelets – seal damaged blood vessels after injury to stop bleeding
  • White Blood Cells – cells of immune system, defend body against infections
    • Phagocytes
    • Lymphocyte
types of white blood cells
Types of White Blood Cells
  • Phagocytes – identify pathogens (disease-producing agents) and ingest them using endocytosis.
  • Lymphocytes: release antibodies which destroy pathogens that cannot be killed by phagocytes
functions of blood
Functions of Blood
  • Main Functions:
    • Transport medium (plasma, red blood cells)
    • Defence against infectious diseases (white blood cells)
  • It also transports heat throughout the body
antibodies
Antibodies
  • Antibodies – proteins that recognize and bind to antigens
  • Antigens – Foreign substances that stimulate production of antibodies
    • e.g cell walls of pathogenic bacteria, protein coats of viruses...
  • Antibodies bind to antigens on surface of pathogens to destroy them
barriers to infection
Barriers to Infection
  • Skin and mucous membranes form a barrier protecting the body.
  • Sebaceous glands in the skin secrete acids to make skin acidic.
  • Mucous membranes (e.g in the nose) produce mucous containing lysozyme.
  • Lysozyme kills bacteria and other pathogens.
antibiotics
Antibiotics
  • Antibiotics – chemicals produced by microorganisms to kill or control growth of other microorganism
  • E.g Penicillium fungus produces penicillin to kill bacteria
  • Human and bacterial cells are very different therefore antibiotics can block a process in bacterial cells without harmin human cells
  • Viruses rely on human cells to carry processes for them, therefore viruses cannot be treated with antibiotics