19 Questions
What is the defining characteristic of an action potential?
Rapid depolarization followed by repolarization
Which type of cells exhibit excitability?
Neurons and muscle cells
What is the role of a stimulus in altering membrane potential?
Inducing rapid changes in membrane polarization
What happens if a stimulation surpasses the excitability threshold?
It triggers an action potential
Where does the excitability threshold typically lie for muscle and nerve cells?
-65mV to -55mV
Which type of current brings the membrane potential closer to the excitability threshold?
'Cathélectrotonus' depolarizing current
What is the primary function of potassium channels during an action potential?
Assisting in repolarization
Which term describes an influx of negative charges that depolarize the cell?
'Cathélectrotonus'
At what membrane potential does an action potential become inevitable?
-55mV
What does the term 'androecium' refer to?
Staminal whorl of the flower
In the context of stamens, what is meant by 'meristemonous'?
The state of continuous growth at the tip
Which term describes the phenomenon when stamen pieces are overlapping?
Convolute
What is the term for the regrouping of stamens in androecium?
Concrescence
In which type of androecium are stamens completely fused into a single structure?
Concrescent
What is the term for a type of androecium where stamens are free and do not fuse at any point?
Meristemonous
Which term describes the arrangement of flower pieces as one piece covering two pieces that are overlapping?
Concrescent
In botanical terms, what is 'quincuncial' preflowering?
'Vexillary' configuration with 5 flower pieces
'Descendingly imbricate' is related to which specific part of a zygomorphic flower according to the text?
'Keel/Karina'
'Pollen grain is produced inside pollen sacs' refers to which part of the male reproductive system of a flower?
'Stamens'
Test your knowledge on the states of sodium and potassium channels, including depolarization, repolarization, hyperpolarization, and resting state. Learn about leak channels for Na+ and K+ as well as the effects of substances like calcium on membrane permeability.
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