The main parts of the urinary system are the kidneys, ureters, urethra, and the urinary bladder. The kidneys clean the blood and the substances cleaned out get made into urine. Urine travels from the kidneys to the ureters to the urinary bladder (a sac made of muscle). The urinary bladder is like a holding cell for the urine until it is emptied out through the urethra. The bladder can hold one liter of urine and can stretch from small to large and vice versa.
A Reference tissue atlas for the human kidney
https://www.science.org/doi/reader/10.1126/sciadv.abn4965
Reference:
Hansen J, Sealfon R, Menon R, Eadon MT, Lake BB, Steck B, Anjani K, Parikh S, Sigdel TK, Zhang G, Velickovic D, Barwinska D, Alexandrov T, Dobi D, Rashmi P, Otto EA, Rivera M, Rose MP, Anderton CR, Shapiro JP, Pamreddy A, Winfree S, Xiong Y, He Y, de Boer IH, Hodgin JB, Barisoni L, Naik AS, Sharma K, Sarwal MM, Zhang K, Himmelfarb J, Rovin B, El-Achkar TM, Laszik Z, He JC, Dagher PC, Valerius MT, Jain S, Satlin LM, Troyanskaya OG, Kretzler M, Iyengar R, Azeloglu EU; Kidney Precision Medicine Project. A reference tissue atlas for the human kidney. Sci Adv. 2022 Jun 10;8(23):eabn4965. doi: 10.1126/sciadv.abn4965. Epub 2022 Jun 8. PMID: 35675394; PMCID: PMC9176741.