I'm guessing here but, some advantages are, embryonic stem cells are very effective at repairing damaged tissues, but they are difficult to obtain, and either have to be obtained from umbillical chords of babies, or from fertilized embryos from a laboratory. So I am guessing they would be expensive/difficult to source because you would either have to collect umbillical chords from babies, or have to purchase eggs from women, and they are ethically questionable to use because you are essentially making potentially viable embryos and then killing them. Hope this helps.
Explanation:
Hormone Signaling. The glands of the endocrine system secrete hormones directly into the extracellular environment. The hormones then diffuse to the bloodstream via capillaries and are transported to the target cells through the circulatory system.
The functional unit of the kidney is nephron. Kidney comprises two kinds of nephrons, each situated in distinct sections of the renal cortex, that is, juxtamedullary nephrons and cortical nephrons. A nephron constitutes of a renal tubule, renal corpuscle, and the associated network of capillaries. The nephron is accountable for eradicating waste from the body.
The functional unit of lungs is alveoli. They resemble a cluster of grapes, they are thin and possess moist walls. They are a single layer of cells enveloped by a layer of capillaries. The main function of the lungs is respiration. The alveoli help one to breathe, by conducting the process of gas exchange.
