Cobalamine which is also known as vitamin B-12 which is very important for the human body. It helps in the synthesis of RBCs and plays an important role in protecting the nerve cells.
Vitamin B- 12 helps in myelin sheath synthesis and maintenance. This myelin sheath makes the outer covering of neurons and plays an important role in the protection of neurons and relaying of signals at high speed.
Deficiency of vitamin B-12 causes damage to myelin sheath which results in different neurological problems. Therefore the correct answer is nerve cells.
Explanation: when the doctor performs a digital rectal exam it is back surface of the gland he is feeling. This is important because about %70-80 of prostate cancer originate in the peripheral.
