Unit 6 - Organisms respond to changes in their internal and external environments
Summary
Summary Stimuli revision notes
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Course
Unit 6 - Organisms respond to changes in their internal and external environments
Institution
AQA
Book
Oxford International AQA Examinations
Detailed and concise a level biology revision notes on the subtopic of stimuli, this includes information on tropism, control of heart rate, the pacinian corpuscle responding to changes in pressure through impulses and definitions of taxis and kinesis.
Layer of non conductive tissue prevents wave
single sensory neurone at centre of tissue layers
crossing
to the ventricles ,
antes AVN after
sensoryneurone contains shreds mediated
ending
delay which conveys the between Nat channels at normal
resting potential
wave
the Nat
,
ventricles along purkinje tissue 1 bundle of His channels are too narrow .
when pressure is applied ,
Wave released from purkinje tissues causing the membrane is deformed channels wider and
,
ventricles to contract Prom the base upwards Nat diffuses into the neurone ,
thischanges the
Charges to heart rate controlled the potential of the membrane (depot arise d) and produces
}
in
H-potnhd-ach-onp-tahda-engthenere-a.ae/eatory oblongata
the brain by the medulla
centre increases heart rate chemoreceptors -
sensitive to ph charges
via
sympathetic nerves to SAN ¥ due to charges in coz concentration
0
-
inhibitory centre decreases heart rate § lower ph higher =
1oz =
higher HR due
§ increased frequency of
via
parasympathetic nerves to SAN to an nerve impulses
-
stimulated by pressure or chemical →§ Pressure receptors increased -
pressure
→
charges £ higher Frequency of impulses to inhibitory centre
¥ impulses parasympathetic nerves 1 decreases HR)
via
?⃝
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