39. Diffusion through membrane lipids Steroid hormone Target cell response CYTOPLASM Alteration of cellular structure or activity Translation and protein synthesis Binding of hormone to cytoplasmic or nuclear receptors Receptor Receptor Nuclear pore Transcription and mRNA production Gene activation Nuclear envelope Binding of hormone– receptor complex to DNA
40. Binding of hormone– receptor complex to DNA Target cell response Alteration of cellular activity Translation and protein synthesis Binding to receptors at mitochondria and nucleus Transcription and mRNA production Gene activation Transport across plasma membrane Thyroid hormone Increased ATP production Receptor