Life Cycle: Painted Lady butterflies undergo complete metamorphosis with four stages: egg, larva, pupa, and adult. Egg-Mint green, barrel-shaped eggs are laid singly on the leaves of host plants, and hatch in 3-5 days. Larva-The caterpillar has five instars over 12-18 days.Pupa-The chrysalis stage lasts about 10 days.Adult-Butterflies live for just two weeks. Special Adaptations and Defenses: The Painted Lady's mottled colors look much like military camouflage, and provide effective cover from potential predators.ainted Lady butterflies undergo complete metamorphosis with four stages: egg, larva, pupa, and adult. Egg-Mint green, barrel-shaped eggs are laid singly on the leaves of host plants, and hatch in 3-5 days.
Initiation of Muscle Contraction. Step 1) Neuromuscular Control. The axons of the nerve cells of the spinal cord branch and attach to each muscle fiber forming a neuromuscular junction. i). An action potential passes down the nerve. ii). The nerve releases Ca++ that results in the release of Acetylcholine (ACh) Step 2). ACh binds with the sarcolemma. Step 3). Muscle Fiber Action Potential. i).
In order for a skeletal muscle contraction to occur; 1. There must be a neural stimulus. 2. There must be calcium in the muscle cells. 3. ATP must be available for energy. So, a few things can stop a contraction; 1. Energy system fatigue: There is no more ATP left in the muscle cell so it canât keep contracting.