DEFENCE MECHANISMS Key Words WHITE BLOOD CELL,

Slides:



Advertisements
Similar presentations
The Body’s Natural Defences
Advertisements

Defending Against Pathogens. First Line of Defence Once a pathogen enters body it can make you ill.... First line of Defence: a barrier to stop entrance.
B1.1 Keeping Healthy Bacteria Weight problems Antibiotics Immunity
GCSE Core ScienceHuman Biology Key Words VACCINE, IMMUNE.
Defenses Against Disease
The Immune System In this lesson, you will Learn About…
 Nonspecific immunity No specific target; treats all foreign substances the same  Specific immunity Treats each microbe differently.
What has happened when a cut in your skin becomes infected? What could have been done to prevent it?
Blood, transport and infections By Tibor Cemicky.
Preventing Communicable Diseases
Defense against Disease
Defence Against Disease
Biology in Focus, HSC Course Glenda Childrawi, Margaret Robson and Stephanie Hollis A Search For Better Health Topic 7: First Line of Defence.
Lesson 2 – The Body’s Defenses Chapter 5 – fighting diseases.
Felt sick recently? You might have been under attack! Many illnesses are caused by living things inside our bodies, called pathogens, that are harming.
The Body’s Defenses The Body’s Defenses Barriers To Infection: Our First Line of Defense- Stopping the invasion  The body has main barriers to infection.
Starter (from the end of last lesson) 1.What are the similarities between a virus and bacteria? 2. What are the main differences between a virus and bacteria?
The Fight Against Infectious Diseases
Immune System BiologyMarch 2014 Ms. Boehm. What is the Immune System? The body’s defense system, which fights off pathogens that cause disease- it keeps.
The Immune System A complex group of defenses found in the body that fight against harmful substances and pathogens Pathogen: infectious agent (or germ)
Lines of Defense 1 Your body has many ways to defend itself.
And infectious diseases
Immunity Objective Understand the action of white cells in the body and the processes of natural and acquired immunity Starter Last lesson you learnt about.
HEALTHY LIVING GERMS AND DISEASES Class 4JH Stanford School Laceby.
Immunity Your body’s defense against infection!. Immune System A group of organs and tissues that protect you from foreign invaders Skin Thymus gland.
Immune System. Disease A disease is any change other than injury, that disrupts the normal functions of the body. Some diseases are inherited, others.
1. The Body’s Natural Defences 2. White Blood Cells 3. Semmelweiss Isobel Houston.
Anatomy and Physiology
THE IMMUNE SYSTEM By Jelani Reyes. Functions Thymus, White Blood Cells, Antibodies  Thymus: The thymus creates antibodies.  White Blood Cells: Kills.
The Immune System Protecting the Body. First Line of Defence The skin keeps out bacteria and viruses The skin keeps out bacteria and viruses Acidic oils.
Fighting Disease Think pair share What is a disease? Use an example to help you answer.
PATHOGENS PATHOGEN, BACTERIA, VIRUS, TOXIN, INFECTIOUS.
IMMUNE SYSTEM Viruses, bacteria and other germs are all around us. Most of the time, a healthy immune system keeps us well. The purpose of the immune system.
IMMUNE SYSTEM. Parts of Human Blood PARTS OF HUMAN BLOOD: 1.Plasma – non-living, yellow liquid part of blood - 92% water - 8% blood proteins, nutrients,
L3: Defence Against Disease Learning Objectives: 1.Describe the body’s first line of defence against pathogens. 2.Explain how white blood cells deal with.
The Human Immune System. What is the Immune System?
Your Body’s Defense. THE BODY’S CAPABILITY OF REMOVING OR KILLING FOREIGN SUBSTANCES, PATHOGENS AND CANCER CELLS Immunity.
FIGHTING DISEASE SBI 3C: OCTOBER DISEASE:  Pathogen:  A disease causing microorganism  Pathogenic bacteria produce toxins once they enter your.
DEFENCE MECHANISMS Key Words WHITE BLOOD CELL,
Unit 4 – Immunology and Public Health Immune system.
The Immune System.
Your Body’s Defense. Physical Defenses  First line of defense  Skin  Hair  Mucous  Cilia  Saliva  Tears  Sweat  Digestive tract.
Communicable Diseases: Diseases that are spread from one person / animal to another.
35.2 Defenses Against Infection
THE BODY’S DEFENSES AGAINST INFECTION. THE BODY’S DEFENSES YOUR FIRST LINE OF DEFENSE- YOUR SKIN AND FLUIDS FORMS A BARRIER BETWEEN YOU AND PATHOGENS.
Defence Against Disease  To understand how the body defends itself against disease Monday, June 06, 2016.
© OUP: To be used solely in purchaser’s school or college 8C Microbes and disease Growing microbes Harmful microbes Self-protection 8C Microbes and disease.
Communicable Diseases. What is a disease? Disease – any condition that interferes with the proper functioning of the body or mind. 2 different categories.
Section 21.2 Defenses Against Disease Slide 1 of 28 For each of your responses, explain how your behavior could affect your chances of getting or spreading.
Microbes and Disease. Microbes are very small living things and are sometimes called micro-organisms. Microbes are so tiny that they cannot be seen with.
Do Now 3/24/15 1.When was the last time you got sick? What did you have? What were your symptoms? 2.Why do people get sick? 3.What happens to your body.
L3: Defence Against Disease
Lymphatic System (pg 338) Vessels that transport lymph through low pressure contractions and valves  Lymph= plasma like fluid that carries important chemical.
Science 8 Life Science Lesson L7 ~ The Immune System
Fighting Disease Noadswood Science, 2016.
The Immune System.
The Immune System Mrs. Green
What keeps us from getting sick?
Your Body’s Defense.
Physical Defenses First line of defense
The Human Immune System
L2: Defence Against Disease
L2: Defence Against Disease
The Body’s Natural Defences
Immune System S7L2e. Students will describe the basic functions of human body systems.
Science 8 Life Science Lesson L5 ~ The Immune System
Presentation transcript:

DEFENCE MECHANISMS Key Words WHITE BLOOD CELL, INGEST, ANTIBODY, ANTITOXIN

By the end of the lesson I will: Objectives By the end of the lesson I will: Know a PATHOGEN is a micro-organism that causes an infectious disease Know pathogens reproduce before they make enough toxins to make you feel ill Know that the best way to protect ourselves is through the first line of defence (the skin) and not let any pathogens into the body Identify the second and third line of defence Know what the white blood cells do to protect your body

How do we get sick? Starter There are four main ways in which you can get sick Droplet infection – When a sick person coughs, sneezes or talks too close to you Direct contact – through skin, kissing or other sexual contact Contaminated food and/or drink – ingestion Break in the skin – scratches or needle punctures

WHAT ARE YOU TRYING TO FIND OUT? WHAT DO YOU EXPECT TO FIND OUT? I know HOW TO USE ASEPTIC TECHNIQUE How do we effect change? We are going to grow some yeast….. AND THEN KILL IT! Using ASEPTIC TECHNIQUE infect a petri dish with a yeast solution. Wait for the solution to slightly dry (perhaps 1hour) Place a full drop of antiseptic onto the centre of the agar plate. Incubate for 24-48hours. WHAT ARE YOU TRYING TO FIND OUT? WHAT DO YOU EXPECT TO FIND OUT?

How many lines of defence do you have in your body? Skin: Provides both a physical (protective layer that completely wraps around the body, shielding blood vessels, nerves, muscles, organs, and bones) and a chemical barrier (When there is a cut or tear in the surface of the skin pathogens can breach the bodies defence and so glands beneath the skin produce an enzyme that helps kill bacteria) 3

Lines of defence 2) Mucous membranes, stomach acid, cilia: Mucous membranes, produce a sticky substance that traps irritants that enter through the nose. Structures like tiny hairs, called cilia, line the body's airways and constantly wave foreign particles and mucus away from the lungs to where they can be swallowed safely. Most harmful microbes that make it to the stomach are destroyed by stomach acids. Tears and saliva both contain enzymes that destroy invaders. The brain-blood barrier, a specialized "filter" that surrounds the brain and spinal cord and acts as a physical barrier to keep out proteins, toxins, and most microbes, while letting in glucose, the source of the brain's nutrients.

Lines of defence 3) Lymphatic system (white blood cells): You have white blood cells in your body that defend it by Ingesting pathogens and destroying them (Never EVER say they eat the pathogen as this is WRONG. The only correct word is INGEST) Some white blood cells produce antibodies that recognise the antigens that are on the surface of the pathogen. The anitbodies of the white blood cell then bind with the antigens of the pathogen which destroys the pathogen or tags it for ingesting by another white blood cell. Each antigen is different and so your body needs to produce an antibody to match each antigen. Some white blood cells produce antitoxins to counteract the toxins produced by some bacteria. The toxins are bound and destroyed.

Lines of defence

Use pages 64-65 to complete the Provided worksheets on Research Use pages 64-65 to complete the Provided worksheets on ‘White Blood Cells’ OR ‘Infection’ Miss will pair you with someone who you will work with. You will complete a different sheet each. You will then have to teach what you have learnt to your partner!

By the end of the lesson I will: Objectives By the end of the lesson I will: Know a PATHOGEN is a micro-organism that causes an infectious disease Know pathogens reproduce before they make enough toxins to make you feel ill Know that the best way to protect ourselves is through the first line of defence (the skin) and not let any pathogens into the body Identify the second and third line of defence Know what the white blood cells do to protect your body