Card Set Information
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
What are antibiotics ?
Chemicals made by fungi or bacteria that can be used as medicine to kill other fungi/bacteria
They cannot handle viruses
What does the iris do?
Controls the amount of light entering the eye
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
Go through the reflex arc
Explain how impulses get from one neurone to another
Neurotransmitters are released allowing impulse to be diffused across the synapse and fired across
List four pathogens and examples for each one
Fungi - athletes foot
Virus - flu
What do anti virals do?
Stop viruses multiplying inside a host
What natural defence so we have on our face? (List five)
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)
What is the difference between a vaccine and a vaccination?
: drug in syringe
: when you get the drug
What happens in the retina?
The focused image forms. The retina is sensitive to light
What is an infectious disease?
A disease that is caused by a parasite that invades your body
How would you calculate your BMI?
What is monocular vision?
Eyes on either side, cannot judge distances, gets a wide view. Often the vision of prey animals
What might children suffer from if they don't get enough protein?
What is first class protein?
Meat. It contains amino acids
What is second class protein?
Plants. Doesn't contain amino acids.
What are the two different types of tumours?
Benign (non cancerous)
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
What is a 'host'?
An organism that has been invaded by a virus or a parasite
What is a parasite?
A dangerous micro-organism
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
Where is fat stored?
Underneath skin and around the organs
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
What are gaps between neurones called?
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