B1.1 Keeping Healthy Flashcards
What is an epidemic?
A disease affecting many people in a country/area
Which spreads quicker, Bird flu or Swine Flu?
Bird flu
Why does bird flu spread quicker than swine flu?
There are more birds than pigs and as birds migrate all over the world it is harder to control their movement.
Why will antibiotics not get rid of the flu?
Antibiotics kill bacteria not viruses, and flu is a virus
Do antibiotics kill viruses or bacteria?
Bacteria
Why should a diet contain fats, protein and carbohydrates?
Fats are needed for energy and insulation
Carbohydrates are needed for energy
Protein is needed for growth (building cells) and repair.
Why does the body need vitamins and minerals?
To maintain health and prevent deficiency such as scurvy, rickets and osteoporosis
Why do pathogens make you feel ill?
Pathogens reproduce quickly and produces large amounts of toxins that damage cells.
Bacteria produce toxins, viruses damage cells.
Name 3 ways white blood cells protect against pathogens…
- White blood cells produce antibodies that destroy pathogens
- White blood cells engulf (ingest and digest) pathogens
- They produce antitoxins that counteract the toxins produced by pathogens.
Why does a vaccination make people immune?
Injecting a patient with a dead/weakened or inactive pathogen. White blood cells produce antibodies which can then be reproduced quickly if infected again.
What is the benefit of vaccinating a large number of people in the same population?
It reduces the risk of spreading an infection so an epidemic is less likely.
What does MMR stand for?
Measles, Mumps, and Rubella
Why can’t you use antibiotics against viral diseases?
Viruses are found inside cells and therefore inaccessible to the antibiotic
Why are there so many antibiotic resistant bacteria these days?
Overusing antibiotics kills all NON-RESISTANT bacteria. Gene mutation causes bacteria to become RESISTANT to the antibiotic and reproduces until all the bacteria is RESISTANT.
What are 3 reasons for the low death rate from infectious diseases in modern hospitals?
Better hygiene Better drugs Better understanding of immunity Sterilisation of equipment Isolation of infectious patients
What is metabolic rate?
The rate of chemical reactions inside the body
What are 3 factors that affect a person’s metabolic rate?
How active a person is Genes BMI Age Gender
What affects the concentration of cholesterol in a person’s blood?
Your diet
Your genes
What diseases are linked to obesity?
Arthritis
Diabetes
High Blood Pressure
Heart disease
Although in labs the incubation of bacteria is kept at 35c, in schools it is limited 25c, why?
To prevent the growth of pathogens
Why are hand gel dispensers found at the entrance of most hospital wards?
It destroys pathogens to prevent the spread of them
How do viruses cause illnesses?
They enter a cell and destroy it
What are the three main stages of testing a drug before it can be sold to the public?
Testing on tissues or animals-toxicity
Testing on small number of healthy volunteers-side effects
Testing on patients-determine optimum dose and effectiveness
Why is it difficult to treat diseases caused by viruses?
VIruses live within cells of the body, so in many cases killing the virus would involve killing the cells themselves- Inaccessible to antibiotics
Viruses mutate quickly
Why does MRSA cause problems in hospitals?
MRSA is resistant to antibiotics
It is easily spread from one patient to another
Patients are often too ill to fight the disease caused by MRSA as well as their original disease.
Why is it a bad idea for drug users to share needles?
Because viruses are transferred through bodily fluids, such as blood
Why must body temperature be kept within a narrow range?
To maintain homeostasis
-To keep the chemical reactions and enzymes within the body working well
What are antibodies?
Proteins produced by white blood cells to kill pathogens
What is a pathogen?
A microorganism that can cause disease
What is an antigen?
A toxin or foreign substances that induces a reaction from the immune system
Found on pathogens
What are the two types of white blood cell?
Phagocyte
Lymphocyte
Whats the adaptations and role of a phagocyte?
Has a large lobed nucleus
Will change shape to perform phagocytosis (engulfing harmful microbes)
Will also squirt digesting enzymes on the pathogen to speed up phagocytosis
What is the role of a lymphocyte?
Will produce specialised antibodies that either cause pathogens to burst OR bind them together in preparation for phagocytosis
Produce antibodies that will bind to antigens and send out singals to phagocytes
Release antitoxins that neutralise toxins given off by the pathogen
What is the role of your nervous system?
To detect your surroundings and protect you
How do vaccines work?
Vaccines work by injecting a dead or weakened form of a pathogen into a patient’s body.
White blood cells within the body will produce antibodies to combat this specific pathogen.
After the pathogen has been destroyed, the white blood cells will remember how to produce the appropriate antibody for that pathogen.
This means that if the body is ever reinfected with that particular pathogen, there will be a rapid response of antibodies to attack the pathogen.
What is metabolic rate and what affects it?
The rate/ speed of the chemical reactions in your body
It can be affected by inherited factors, gender, climate, exercise, diet
What are fortified foods?
Often milk and cereal, fortified foods have been intentionally inserted with vitamins
Where can you find vitamin A, C, D, Calcium, and Iron?
(in order) Carrots Citrus Sunlight / fish Dairy Red meat, green veg
What are the benefits of fruit and vegetables?
Provide fibre for digestion and vitamins and minerals to maintain health
What is the role of carbohydrates?
To provide energy eg starch and glucose
What is the role of protein?
Growth and repair of cells
Who suggested washing hands in hospitals?
Ignaz SEMMELWEISS
Why did few people accept Semmelweiss’ ideas?
Pathogens had not been discovered and so people did not know it was the harmful pathogens on the hands that were causing disease
How did Semmelweiss come up with the practise of washing hands before entering wards?
In maternity wards, mothers were more likely to survive if treated by nurses and widwives who only worked in that ward
Doctors who entered from other wards brought diseases with them
