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).
Within the sarcomere, myosin slides along actin to contract the muscle fiber in a process that requires ATP. Scientists have also identified many of the molecules involved in regulating muscle contractions and motor behaviors, including calcium, troponin, and tropomyosin.he contraction of myosin's S1 region is called the power stroke (Figure 3). The power stroke requires the hydrolysis of ATP, which breaks a high-energy phosphate bond to release energy.