Chemicals which are released at the synaptic junction are called
1. hormones
2. neurotransmitters
3. cerebrospinal fluid
4. lymph
(b) Neurotransmitters are involved in the transmission of impulses at the chemical synapses. They are present in the synaptic vesicles at axon terminals.
Whereas, hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts.
Cerebrospinal fluid is present in subarachnoid space. It provides shock resistance to brain.
Lymph is a colourless fluid containing specialised lymphocytes which are responsible for the immune responses of the body.It is important carrier for nutrients, hormones, etc. Fats are absorbed through lacteals (lymph vessels) present in microvili of intestine.
