Well, the parenchyma is the functional tissue of the kidney. The tiny functional unit of the kidney is the nephron. Nephrons have individual microscopic components: the glomerulus, the tubule, and collecting. However your question may just want "nephrons."
Answer:
The skin is very important for the functioning of the nervous system, this is because, it serves as the sensory organ, which transmit the sense of touch to the brain for interpretation. The skin acts as the receptors of stimuli that are coming from outside of the body. For instance, if one mistakenly touch an hot pot with a bare hand, one will quickly remove the hand immediately. This is because the skin was able to sense the touch of hotness and send the information to the brain for the correct interpretation of the stimuli. Therefore, without the skin, the functioning of the nervous system will be impaired.
Alleles or genes m8. Could also go with traits maybe but that’s not as specific