[Solved] Which of these structures in the kidney is sensitive to changes in the volume and pressure of blood and can release renin to regulate the changes? A) Vasa recta B) Juxtaglomerular cells C) Collecting duct D) Hilum E) Mesangial cells Optical Microscope: An instrument that uses visible light and lenses to magnify objects, allowing for the observation of small details that cannot be seen by the naked eye. Focus Control: The adjustment or regulation of the clarity and sharpness of an image in photography or optics. Sterilization: The destruction of all microorganisms, including bacterial spores, by specific means. Organisms: Living entities that can act or function independently, ranging from single-celled bacteria to complex multicellular forms like animals and humans.