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shotguniall
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Why are motor neurones so well adapted? (3reasons)
- They have insulation sheaths (no loss of current)
- They are long
- They have branched endings for communication
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What are antibiotics ?
- Chemicals made by fungi or bacteria that can be used as medicine to kill other fungi/bacteria
- They cannot handle viruses
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What does the iris do?
Controls the amount of light entering the eye
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What two things does the lens do?
- 1) refracts light-rays, focuses light
- 2) changes shapes depending on whether we want to see up close or far away
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Go through the reflex arc
- Stimulus
- Receptor
- Sensory neurone
- Relay neurone
- Motor neurone
- Effector
- Response
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Explain how impulses get from one neurone to another
Neurotransmitters are released allowing impulse to be diffused across the synapse and fired across
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List four pathogens and examples for each one
- Fungi - athletes foot
- Bacteria- cholera
- Virus - flu
- Protozoa- malaria
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What do anti virals do?
Stop viruses multiplying inside a host
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What natural defence so we have on our face? (List five)
- Eyelashes
- Ear hairs
- Nose hairs
- Saline tears
- Saliva
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What does EAR mean and stand for?
- How is it calculated?
- Estimated average requirement of protein a person should eat each day
- It is calculated by 0.6 x body mass (kg)
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What is the difference between a vaccine and a vaccination?
- Vaccine: drug in syringe
- Vaccination: when you get the drug
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What happens in the retina?
The focused image forms. The retina is sensitive to light
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What is an infectious disease?
A disease that is caused by a parasite that invades your body
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How would you calculate your BMI?
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What is monocular vision?
- Eyes on either side, cannot judge distances, gets a wide view. Often the vision of prey animals
- Example: horses
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What might children suffer from if they don't get enough protein?
Kwashiorkor
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What is first class protein?
Meat. It contains amino acids
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What is second class protein?
Plants. Doesn't contain amino acids.
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What are the two different types of tumours?
- Benign (non cancerous)
- Malignant (cancerous)
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List three ways a person can reduce the risk of developing cancer
- Do not smoke
- Do not drink
- Stay out of UV light
- Keep exposure to dangerous fumes low
- Eat healthy with a diet full of vitamins and minerals
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What is a 'host'?
An organism that has been invaded by a virus or a parasite
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What is a parasite?
A dangerous micro-organism
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What is systolic pressure?
- The first number you are given when your blood pressure is measured.
- It tells you the highest point of pressure that the heart pumps blood
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Where is fat stored?
Underneath skin and around the organs
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What does it mean to be long sighted? How can you solve the problem?
Your eyeball is too short. A pair of glasses with convex lens helps the problem
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What are gaps between neurones called?
Synapses
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What does it mean if someone is short sighted? What can be done to solve the problem?
Their eyeball is too long. A pair of glasses with concave lens help
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