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).
Muscle Contraction. Muscle fibers contract in response to nerve stimuli from your central nervous system. This is an active process that involves the release of calcium at the cellular level of the muscle fiber, and causes a ratcheting effect that results in the shortening, or contracting, of individual muscle fibers.HARE SHARE TWEET EMAIL. Muscle contraction and relaxation occurs in your body multiple times during the course of a day, especially if you are active. Muscles have fibers, and the fibers are grouped into fascicles, or bundles, which form individual skeletal muscles.