Communicable Diseases Flashcards
the scary diseases that ANY of us can contract, and WHY...!
What is a pathogen?
- This is a microorganism that can causes diseases in other organisms, acting as the host
Explain the bacteria that causes disease…
Undergoes binary fission by means of reproduction, damaging cells through toxins released.
* PROKARYOTES
* Reletivly large, compared to the virus
Explain the fungi that causes disease
- Grows into structures of micellium as main-body structures, that may grow into mushrooms.
- Produces reproductive hyphae, releases spores in the atmosphere to reproduce across environment
- Hyphae = releases extracellular digestive enzymes (cellulase) causing additional decay
Explain the Viruses that causes disease
- Invade organism cells, using genetic machinery to manufacture more copies of same virus
- Host cell will burst, cusing cell damage, relasesing many more viruses to invade further cells
- NON-LIVING, according to M.R.S G.R.E.N
Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion and Nutrition.
Explain the Protists that causes disease
- These enter host’s cell, and will feed with the available nutrition to grow and reproduce
- Normally carried with vectors, and transfered through fluids/contact
e.g Plasmodium via Mosquitoes…….
How does Ring Rot come about?
- Occurs in PLANTS
- Caused by BACTERIA
- Ring of decay around vascular tissues in potatoes/tomatoes, alongside leaf wilting
How does Tobacco Mosaic Virus come about?
- Occurs in PLANTS
- Caused by VIRUSES
- Leaf discolouration in mosaic-like pattern in many plants.
How does Blight come about?
- Occurs in PLANTS
- Caused by PROTISTS
- Chlorosis and browning of plant tissues in potatoe tubers, alongside leaf wilting
How does Black Sigatoka come about?
- Occurs in PLANTS (bananas mostly)
- Caused by FUNGI
- causing leafing spots on bananas, significantly reducing yeilds
How does Athlete’s Foot come about?
- Occurs in ANIMALS (human mostly)
- Caused by FUNGI
- Redness, Itching and flaking of growth between toes in feet.
How does Ring Worm come about?
- Occurs in ANIMALS
- Caused by FUNGI
- Ring-shaped growth with spores erupting through the skin, causing rashes in mammals
How does Influenza come about?
- Occurs in ANIMALS
- Caused by VIRUS
- attacking respiratory system, causes muscle pains and headache in humans
How does Bacterial Meningitis come about?
- Occurs in ANIMALS
- Caused by BACTERIA
- infection of the meninges, being membranes surrounding brain and nerves , may become inflamed/swollen
How does HIV come about?
- Occurs in ANIMALS
- Caused by VIRUS
- **destroys the immune system by attacking WBCs, compromising immune response ** in humans
- Becomes AIDS when developed for a while, becoming much more susceptible to many other diseases
What makes HIV a more unique virus to many?
- This is a RETROVIRUS!
- Will contain RNA rather than DNA, like a regular virus
- Will have enzyme Reverse Transriptase, to convert single stranded RNA genome to DNA when injected into host cell’s machinery
Why would Bacteria and Fungi thrive more in vascular tissue, in a plant?
- Abundant supplyof water (xylem) and sugar+nutrients (phloem)
- Will MASSIVLEY aid for optimal growth in these organisms
How does Malaria come about?
- A parasite in the bloodstream that can cause headaches and repeating episodes of fever - comas and even DEATH
- Protist = Plasmodium Falciparum
How does Tuberculosis (TB) come about?
- Occurs in ANIMALS
- Caused by BACTERIA
- Killing cells in the entire body, mainly affecting respiratory systems (lungs…)
Give and explain the methods of Direct Transmissions of disease
- Physical Contact: direct touching involved my ANY means; stopped by Condoms, Disinfectant, Sterilising equipments
- Feacal/Oral: Consuming anything with pathogens; stopped by Sewage Treatment, Cooked and Washed meats
- Droplets: Pathogens carried in air via drops; stopped by “Catch it - Kill it -Bin it”, tissues when sneezing
- Spore Transmission: Fungal/pathogenic spores carried in air; stopped by masks when needed, wash skin after soil contact
Give and explain the methods of Indirect Transmissions of disease
- Vector Transmission: another organism used to gain entry into primary host, without harming this organism; stopped byKilling potential vector organisms, vaccinations, sterilising vectors
- Fungal Spores: airborne transission carried in the air; stopped by Condoms, Disinfectant, Sterilising equipments
- Leaf Distribution: Infected leaf shedding falls to soil, able to reproduce, and infect other plants ; stopped by Incinerating infected leaves/entire plant before shedding
How does Malaria infect an individual?
- A female anopheles mosquito will suck blood of infected person
- Will also pick up gammetes of plasmodiumin the bloodstream
- Plasmodium will be nurtured and develop in mosquitotes salivary glands
- Another person is bitten
- Inside the liver, the parasites invade liver cells and multiply asexually to form more parasites.
- After maturing, the liver cells burst, releasing many parasites back into the bloodstream.
- The parasites (plasmodium falciparium) then invade erythrocytes, where they continue to multiply and cause the symptoms of malaria.
and cycle starts over!!
What are Passive Defences in organsims?
- These are defences in place BEFORE a pathogen infection has taken place, preventing initial entry of said pathogen!!
What are Active Defences in organisms?
- These are defences in place AFTER a pathogen infection has taken place, preventing internal speading of said pathogen, using ENERGY, and CHEMICALS (mostly….)
What is a way to remeber Plant Physical Defences?
- LST CW BC = Lost Cow Back!
= Ligin, Stomata, Tylose, Cellulose, Waxy Cuticle, Bark, CALLOSE,