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Unit 5 revision
Terms and definitions for Edexcel Biology Unit 5
96
Biology
12th Grade
05/05/2013

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Term
ATPase
Definition
catalyses ATP > ADP + Pi and ADP + Pi > ATP
Term
AVN
Definition
causes the delay that synchronises atria and ventricles
Term
CT scan
Definition
uses focussed x-rays to image the brain
Term
GM organism
Definition
an organism with recombinant DNA
Term
Hubel and Wiesal
Definition
investigated vision
Term
Human Genome Project
Definition
sequencing all the bases from all the chromosomes
Term
IAA
Definition
auxin
Term
L-Dopa
Definition
Drug used in the early stages of Parkinson's
Term
MDMA
Definition
ecstasy
Term
MRI
Definition
brain imaging using high frequency sound and a magnetic field
Term
NAD and FAD
Definition
hydrogen acceptors
Term
Parkinson's disease
Definition
may be treated by drugs, electrical stimulation or genetic modification
Term
SAN
Definition
heart beat originates here
Term
acetylcholine
Definition
neurotransmitter in motor end plates
Term
actin
Definition
thin fibre in muscle cells
Term
action potential
Definition
plus 40 mv
Term
anaerobic
Definition
respiration without oxygen
Term
animal model
Definition
provides evidence about how human systems work
Term
antagonistic
Definition
system with two opposite components e.g. muscles
Term
axon
Definition
extended efferent part of neurone
Term
bundle of His
Definition
transmits the wave of contraction to the ventricles
Term
calcium
Definition
triggers muscle contraction and transmission at synapses
Term
carbon dioxide
Definition
respiration waste
Term
cardiac output
Definition
volume of blood from a heart contraction
Term
cardiovascular control centre
Definition
controls heart rate
Term
cardiovascular disease
Definition
may be detected by ECG
Term
cation channels
Definition
gated channel
Term
cerebellum
Definition
coordinates our movements
Term
cerebral hemisphere
Definition
where sensory, motor, association, personality, memory are
Term
chemiosmosis
Definition
flow of hydrogen ions across a membrane releasing energy for ATP production
Term
coenzyme
Definition
assists enzyme e.g. as a hydrogen acceptor
Term
critical window
Definition
if it doesn't happen then, it may not
Term
cross-cultural study
Definition
used to provide evidence for nature over nurture
Term
cruciate ligament
Definition
keeps the knee straight
Term
dopamine
Definition
neurotransmitter in sustantia nigra cells
Term
effector
Definition
gland or muscle
Term
electrocardiogram
Definition
detects electrical activity in the heart
Term
electron transport chain
Definition
proteins positioned on the membranes of the cristae
Term
extensor
Definition
extends skeleton at a joint
Term
fMRI
Definition
indicates where brain functions are
Term
fast twitch
Definition
muscle cells relying on anaerobic respiration
Term
final electron acceptor
Definition
oxygen in aerobic respiration
Term
flexor
Definition
flexes skeleton at a joint
Term
glucose
Definition
respiratory susbstrate
Term
glycolysis
Definition
in the cytoplasm, produces pyruvic acid
Term
habituation
Definition
nervous system adapts to experience
Term
hexose
Definition
six carbon sugar
Term
homeostasis
Definition
maintaining a steady state
Term
hormone
Definition
produced by endocrine cells
Term
hydrolysis
Definition
bonds breaking with the addition of a water molecule
Term
hyperpolarisation
Definition
below -70 mv
Term
hypothalamus
Definition
controls breathing and heart rate
Term
immune suppression
Definition
possible effect of over-training
Term
keyhole surgery
Definition
minimalist operation e.g. joint surgery
Term
krebs cycle
Definition
generation of reduced coenzymes, carbon dioxide and ATP in the matrix
Term
lactate
Definition
end point of anaerobic respiration
Term
ligament
Definition
attaches bone to bone in a joint
Term
medulla oblongata
Definition
controls heart and breathing rates
Term
mitochondria
Definition
organelle carries out aerobic respiration
Term
motor neurone
Definition
carry impulses from CNS to effector
Term
muscle
Definition
contractile tissue
Term
myelin sheath
Definition
speeds up impulses by insulating the axon
Term
myogenic
Definition
contracts without an impulse
Term
myosin
Definition
thick fibre in muscle tissue
Term
negative feedback
Definition
returning a value back to the normal range
Term
neurotransmitter
Definition
crosses the gap
Term
nodes of ranvier
Definition
gap in the myelin sheath
Term
obesity
Definition
possible effect of too little exercise (and too much energy input)
Term
opsin
Definition
the active molecule when light hits a rod or cone
Term
oxidative phosphorylation
Definition
addition of a phosphate group together with the transfer of electrons
Term
phosphorylation
Definition
addition of a phosphate group
Term
phototropism
Definition
growth towards light
Term
phytochrome
Definition
has red and far red forms
Term
post transcriptional processing
Definition
cutting and splicing mRNA to reorganise introns and exons
Term
potassium ion
Definition
rushes out
Term
prosthesis
Definition
artificial replacement of a body part
Term
pupil dilation
Definition
a simple reflex
Term
pyruvic acid
Definition
end point of glycolysis
Term
relay neurone
Definition
connect neurones in CNS
Term
retinal
Definition
replaced with vitamin A
Term
rhodopsin
Definition
visual purple
Term
rods
Definition
photoreceptor
Term
schwann cell
Definition
wraps around an axon
Term
sensory neurone
Definition
carry impulses from receptor to CNS
Term
serotonin
Definition
neurotransmitter related to ecstasy and depression
Term
sodium ion
Definition
rushes in
Term
spirometer
Definition
used to measure tidal volume and oxygen absorbtion
Term
synapse
Definition
chemical connection between neurones
Term
tendon
Definition
attaches muscle to bone
Term
thermoregulation
Definition
controlling body temperature
Term
tidal volume
Definition
volume of air moved by a breath
Term
transcription factor
Definition
controls the expression of a gene
Term
tropomyosin
Definition
protein attached to troponin, blocks binding sites
Term
troponin
Definition
protein attached to myosin, moves when calcium binds
Term
twin study
Definition
used to provide evidence for nature over nurture
Term
ventilation centre
Definition
controls breathing rate
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