Muscle contraction ends when calcium ions are pumped back to the sarcomere. During stimulation of the muscle cell, the motor neuron releases the neurotransmitter acetylcholine which travels across the neuromuscular junction (the synapse between the terminal bouton of the neuron and the muscle cell).
Hellebore. Helleborus. Hellebores are so easy and so pretty, they have a place in nearly every landscape. Their exquisite bowl-or saucer-shape flowers in white (often speckled), pinks, yellows, or maroon remain on the plant for several months, even after the petals have fallen. Deer-resistant and mostly evergreen, hellebores' divided leaves rise on sturdy stems and may be serrated (like a knife) along the edges. Grow hellebores in shade where soil remains moist; some hellebores prefer acid or alkaline conditions, depending on variety.
It is important to divide these plants carefully, however, or else you risk sadness with fewer blooms, lopsided plants or even losing these gems. Fortunately, itâs possible for even a novice hellebore lover to divide their plants with confidence. Divide hybrid hellebores in the spring when it is in bloom. This will also let you see how the blooms are positioned on the plant so you can divide shapes appropriately. Choose a plant that has at least 5 flower stems.