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.
This species encompasses several distinct varieties of Asian herb, seed, and vegetable crop, including shiso and deulkkae. The genus name Perilla is also a frequently employed common name (perilla), applicable to all varieties. Perilla frutescens are annual plants with square stems and serrated leaves. The leaves are arranged in opposite pairs, and the leaf colours range from green to dark green, purple to purplish red. The flowers are white to purple and the seeds can be soft and hard, being white, grey, brown, and dark brown in colour.