The renal and adrenal models are teaching tools used in biology education to demonstrate the anatomical structure and function of these two important organs in the human urinary and endocrine systems. In biology teaching, kidney models can help students intuitively understand the anatomical structure of the kidneys and their roles in filtering blood, forming urine, and regulating electrolyte balance. The adrenal model displays the cortex and medulla of the adrenal gland, helping students understand its function in endocrine regulation, such as secreting hormones such as cortisol and adrenaline. By observing and operating these models, students can grasp the structure and function of relevant organs, and understand their importance in maintaining homeostasis in the body.