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BIOLOGY B1 (Fitness and Blood Pressure (Blood Pressure (Increases (Blood…
BIOLOGY B1
Fitness and Blood Pressure
Healthy
Fitness
Highest
Contracts
Systolic Pressure
Lowest
Relaxes
Diastolic Pressure
Blood Pressure
Increases
Smoking
Over weight
Alcohol
Long term stress
Blood vessels burst
Stroke
Brain Damage
Kidney Damage
mmHg
Low Blood Pressure
Causes
Dizziness
Fainting
Poor Circulation
Tissues don't get enough oxygen
Diet Problems
Too little protein
Kwashiorkor
Swollen stomach
In developing countries
over-population
Not enough money
Estimated average daily requirement
EAR (g) = 0.6 x body mass (kg)
Changes
Age
Pregnancy
Eating Disorders
Anorexia Nervosa
Self starvation
Bulimia Nervosa
Binge eating
self induced vomiting
other illnesses can be caused
liver failure
kidney failure
heart attacks
Muscle wastage
Body Mass Index
below 18.5 - underweight
18.5 to 24.9 normal
25 to 29.9 - overweight
30 to 40 - moderately obese
above 40 - severely obese
BMI = body mass / (height) SQUARED
High Blood Pressure and Heart Disease
Smoking
Increases Blood Pressure
Carbon Monoxide
Combines with Haemoglobin
Reduces amount of oxygen
Nicotine
Increases heart rate
Contracts more often
Blood Pressure increase
Poor Diet
Heart disease
Heart attack
Lots of saturated fats
Salt
Salt
Required in small amounts
Damaging arteries
Cholesterol
Builds up
Plaques block arteries
Is required for cell membranes
Thrombosis
Narrows arteries
Blood clot
Can cut off oxygen
Eating Healthily
Six essential nutrients
Carbohydrates
energy
Made of simple sugars
glucose
Stored in the Liver as GLYCOGEN
Converted to fats
Fats
Energy
Insolation
Made of fatty acids and glycerol
Stored under skin
Stored around organs as adipose tissue
Proteins
Emergency energy
growth and repair
Amino acids
Vitamins
Vitamin C - prevent scurvey
Minerals
iron - make haemoglobin
Water
Prevent dehydration
Requirements vary
Age
Gender
Physical Activity
Different diets
Religious
Personal
Vegan
Vegetarian
Medical
Allergic
Intolerant
Infectious Disease
Pathogens (microorganisms)
Fungi
Protozoa
Single celled organism
Viruses
Bacteria
Maleria
Caused by a Protozoan
Mosquitos
Vectors
Blood
Parasite
Host
Feed off Infected
Prevent by...
Nets
Drain water
Fish
Insecticides
Immune System
Pathogen enters body
Consume them (WBC)
Producing Antitoxins
Producing Antibodies
Memory cells
Naturally Immune
Specific
Preventing + Treating Infectious Disease
Immunisation
Stops you getting diseases
Dead or Inactive Pathogens
Harmless
White Blood Cells produce Antibodies
Memory Cells
Risks
Short term side effects
Could link to other illnesses
Can't have vaccine if ill
Benefits
Prevents illness
Helps stop it spreading
Antibiotics
Kill bacteria
Bacterial Infections
Not viruses
Antivirals
Naturally Resistant bacteria