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.
Dracaenas are Agave relatives and are a large group of plants that include some of the more popular house plants as well as some of the most striking xeric and massive trees used in outdoor landscaping.This article is an introduction to this interesting group of plants.Dracaena is a large genus of primarily African monocot plants of which there are well over 100 accepted species, most which will not be covered in this article and are virtually unknown in cultivation.his article is an introduction to this interesting group of plants. Dracaena is a large genus of primarily African monocot plants of which there are well over 100 accepted species, most which will not be covered in this article and are virtually unknown in cultivation.