bi, b2, b3


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  • Created by: gbow231
  • Created on: 20-06-15 13:03
what 2 readings does blood pressure have?
diastolic and systolic pressure
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what can increase blood pressure?
smoking, alcohol, saturated fats and salt
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what can high blood pressure damage?
the brain and kidneys
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what is being fit?
the ability to do exercise
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what is being healthy?
being free from disease
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what is the body mass index use for?
to indicate being over or underweight
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what can EAR be used to calculate?
protein requierments
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what are harmful drugs classified as?
a, b, c
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what rug classification is the most harmful?
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what do depressant and stimulant drugs affect?
the nervous system by affecting the transmissions across the synapses
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what can high levels of alcohol cause?
cirrhosis of the liver
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What does immunisation protect against?
certain diseases by using harmless pathogens
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what is a mosquito?
a vector that carries malaria
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what is the pathogen that causes malaria?
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what is plasmodium?
a parasite that uses humans as its host
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what is homeostasis?
is maintaining a constant internal enviroment
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what do automatic systems in the body do?
water, temperature and carbon dioxide levels constant
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what does the hormone insulin do?
control blood sugar levels, it converts excess blood glucose into glycogen
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whats does vasodilation and vasoconstriction do?
it controls heat transfer from the body
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What are Auxins?
a group of plant hormones
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what do Auxins do?
they cause shoot curvature by cell elongation
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what is phototropism?
response to light
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what is geotropism?
response to gravity
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how does the eye accomodate?
by altering the shape of the lens
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the eeyeball of the lens being the wrong shape can casue?
long or short sight
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what does a nerve impulse travel along?
the axon of a neurone
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what does a spinal reflex involve?
a receptor, sensory, relay and motor neurones and an effector
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What are Alleles?
different version the the same genes
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How is sex determined?
by sex chromosomes, ** in female and xy in male.
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How many chromosomes do human body cells have?
23 pairs
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What are inherited disorders caused by?
faulty alleles
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when are dominant alleles expressed?
if present
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when are recessive alleles expressed?
in the absence of a dominant allele.
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if you are homozygous you have...?
two identical alleles
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if you are heterozygous you have...?
two different alleles
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what are most faulty alleles?
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Organisms can...?
eat each other, gain from each other and feed of each other
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what is mutalism?
where two organisms gain from each other
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what is a parasite?
where two organisms feed of each other
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what can pyramids of biomass and numbers show?
feeding relations
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what does the recycling of carbon involve?
photosynthesis, feeding, respiration and decomposition
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organisms in hot dry areas have adaptations to...?
increase heat loss, move on sand, cope with lack of water
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What does Darwin's theory of natural selection involve?
variation, competition, survival of the fittest and selective reproduction
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what does heat loss from organisms depend on?
their surface area to volume ratio
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organism in cold conditions are adapted to?
keep warm and move on the snow
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examples of natural selection are?
warfarin in rats, antibiotic resistance in bacteria and frequency of colour in peppered moths.
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How can pollution be measured by?
using direct methods or by using indicator species.
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why is conservation important?
to protect our food supply, prevent damages to food chains, protect organisms for medical uses and protect habitats for people to visit
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Where does protein synthesis occur?
on ribosomes in the cytoplasm
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what are proteins made of?
long chain molecules
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how are the codes needed to produce a protein carried to the ribosomes?
by a molecule called mRNA
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proteins are coded for by DNA...
the base sequence codes for the order of amino acids, each amino acid is coded for by three bases
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What might mutations lead to?why?
the production of different proteins, this is becasue a change in the bases in DNA can change the amino acid sequence
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What do enzymes work by?
a 'lock' and 'key' method.
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Other cards in this set

Card 2


what can increase blood pressure?


smoking, alcohol, saturated fats and salt

Card 3


what can high blood pressure damage?


Preview of the front of card 3

Card 4


what is being fit?


Preview of the front of card 4

Card 5


what is being healthy?


Preview of the front of card 5
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