1 The Centers for Disease Control and Prevention (CDC) recommends 2 doses of quadrivalent meningococcal conjugate vaccine for adolescents 11 through 18 years of age.  The first dose should be given at 11 or 12 years of age, followed by a booster dose at age 16.
Figure- The synchrony between the three major system of human body. The major differences between hormones and neurotransmitters are as follows-. â¢ Neurotransmitters belong to the nervous system, whereas hormones belong to the endocrine system. â¢ Transmission of neurotransmitters is across the synaptic cleft, whereas that of hormones is by blood. â¢ Hormones are produced by endocrine glands while neurotransmitters are produced by neurons.
Hormones are Chemical Messengers whereas Enzymes are Biological Catalysts. Hormones are released by the glands directly into the blood stream which then travel in whole body reaching their target organ or parts. This implies that the site of origin and site of action of hormones are different.