The function of the renal medulla is to hold masses of tissues called renal pyramids in each kidney, according to InnerBody. These pyramids face towards the convex or inner part of the kidney, while the bases face the outside part of the organ. The renal medulla is the innermost part of the kidney protected by the renal cortex on the outside.
Renal pyramids consist of blood vessels and tube-like structures that collect filtrate. These pyramids contain nephrons, the basic unit that filters blood in the kidneys, according to Healthline. Millions of nephrons extend from the cortex to inner regions of the kidney. These structures regulate water concentration, extract salts from blood and reabsorb needed nutrients back into the body. Waste material is then excreted through urine. This process helps regulate blood pressure and blood volume throughout the body.
Medulla regions are darker than the outer cortex. Healthline states that most humans have seven pyramid structures inside the renal medulla. The pyramids appear striped because nephrons align parallel to each other throughout the inner kidney.
Kidneys help maintain homeostasis in the body by regulating water, ions and acid-base levels in the blood. The bean-shaped organs secrete hormones that regulate blood pressure, bone marrow levels and vitamin D absorption, according to About.com.Learn More
The main function of the heart is to pump blood to the lungs to be saturated with oxygen, and then pump it out into the body to supply the cells with oxygen. The heart, along with the blood vessels, make up the cardiovascular system.Full Answer >
Human ears consist of three parts: outer ear, middle ear and inner ear. Sound waves travel through the outer ear onto the eardrum, transmitted through the middle ear to the inner ear in the form of vibration. These vibrations are then converted into electrical impulses and sent to the brain.Full Answer >
Alveoli have a large surface area in order to rapidly exchange gases, which is the primary function of the lungs. There are approximately 300 million alveoli found inside the lungs.Full Answer >
The human brain's memory involves three basic processes: encoding, storage and retrieval. Memories are stored in the hippocampus, where neurons in the brain connect to various cortexes responsible for different processes. For instance, neurons go from the hippocampus to the visual cortex for memories seen by the eyes and to the auditory cortex for memories associated with sound.Full Answer >