Lecture 23 - E cells in microbes and plants Flashcards
what was the evolutionary order of ion channels
K then Ca then Na
in bacteria, what can changes in membrane potential possibly regulate
feeding behaviour
what is special about paramecium
has fast locomotive movement controlled by Ca2+ based APs in response to stimuli
when mechanoreceptor in front of paramecium is stimulated, what would this cause
AP fired
causes ciliary to change direction and it swims backwards
how does the paramecium swim normally again
membrane has to repolarise via delayed opening of K+ channel (same as mammals)
what happens if K+ mechanoreceptors on Paramecium’s back is stimulated
goes faster
how do cilia move in paramecium
axoneme arrangement of microtubules with dyenin
what can mimosa pudica do
plant that can rapidly move its leaves to expose thorns as defence in response to stimuli
how is movement caused in mimosa pudica (name of mechanism)
excitation-turgor loss coupling
Cl- based APs
leading to cell shrinkage, but only on one side, so it bends down
what tissue does movement occur in in mimose pudica
pulvinus
what is dionea muscipula and what can it do
venus flytrap
fires Ca2+ based APs of 150mV for 1-3 seconds
how can cell to cell transmission of APs occur in venus flytrap
via plasmodesmata
