Year 9 'First' Science Exam Revision

Year 9 'First' Science Exam Revision

1. Fitness and Health

   • Fitness- The ability to perform exercise Health- Absence of disease- certain factors can put at risk of becoming unhealthy
   • Heart Rate- how fast H.R goes back to normal
   • Stamina- How long you can exercise for
   • Aglity-Change of direction at plase

2. Staying Healthy And Diseases

   • Diseases
     • Organisms that cause disease are called 'Pathogens'
     • Fungi- Althete's foot Virus- Flu Bacteria- chloera Protozoa- malaria

3. Human Health and Diet

   • Healthy Eating
     • This is what are food is broken down into <-
       • Fat- under skin, around organs (adipose tissue) Carbs- Liver( as guycogen) or converted to fat Protein- Not Stored in the body
     • Protein
       • To work out your Estimated Average Daily Requirement (EAR) of Protein (g) all you do is; 0.6 x Your body mass (Kg)
       • First-Class Protein = In meat and fish ( animal Protien) Secondary- Class Protein= Plant Protein
     • BMI
       • To work out you Body Mass Index (BMI) BMI= mass (Kg) / height ( in metres squared)
         • This chart shows the bands of BMI for Audlts
       • I worked out that my BMI is 22.2, going with the adults chart im in the normal range
   • Human Health
     • Heart Disease
       • Smoking is a big risk for heart disease, a cigarette contains Carbon Monoxide which takes over the oxygen in the Red Blood Cells, this means the Heart has to work faster tom provide cells with more Oxygen
       • Being Obese can also lead to Heart Disease. Cholesterol can bulid in the arteries causing plaque and narrowing of the arteries, this can sometimes cause a blood clot. From eating to much fat the coronary arteries can become blocked and can even lead to an heart attack

4. The Eye and Nervous System

   • The Eye
     • This is the structure of the eye
   • Nervous System
     • Stimulus- A change in the evironment thta we detect and respond to
     • Receptors- Speclalised cells that detect the stimulus
     • Effector- A muscle or gland that wil bring about the response to a stimulus

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