If the stimulus reaches the threshold an action potential will be generated. If the stimulus doesn't reach it no action potential will be generated. If the stimulus will be stronger the action potential will have the same amplitude. The refractory period makes it harder to generate an action potential so they decrease the frequency of action potential production.
Answer: neuron, collection of neurons, brain, nervous system.
Explanation:
The smaller veins in the leaf connect to the <u>margin </u>of the leaf.
<u>Explanation:</u>
The structural and important part of the plant is the leaf. The leaf is the main source of photosynthesis. The leaf has small vein like structures to carry the prepared food and energy sources to be distributed throughout the plant.
The smaller veins in a netted pattern run across the leaves to meet the margin of the leaf. The veins run laterally from the midrib to the margins hence providing a proper network and hence passing of the nutrients made feasible in an accommodative way.