(i) Two types of receptors are
(a) Membrane bound extracellular receptors.
(b) Intracellular receptors.
(ii) The hormones which cannot enter the target cell, need membrane bound (extracellular) receptors and the hormones which can enter the target cell, need intracellular (mostly nuclear) receptors.
(iii) Second messengers are those chemicals, which are generated in the target cells, by those hormones which con not enter the cells, to bring about the biochemical changes, e.g., inositol triphosphate (IP-J cyclic adenosine monophosphate (cAMP).
(iv) Lakshita is worried about her studies and has capability to understand things in a better and scientific way, she is an initiative taker.