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.
Hyacinth-Flowererd Candytuft, Iberis amara, is a cool weather, fast growing annual plant that grows 6-18 tall and will spread to about 6.It has small, lance shaped green leaves and produces slightly rounded, 4-6 clusters of fragrant white, pink or lavender tinged flowers from early spring into the summer.vergreen Candytuft, Iberis sempervirens, are woody, 6-12 tall sub-shrubs that will spread to about 18-24. They have glossy, dark green, 1Â½ leaves and produce 1Â½-2 clusters of white, unscented flowers during the spring and early summer.