What's is cAMP in chemical coordination??

“ It is the type of coordination present between the cells or different organs within the body of multicellular organisms. In this kind of coordination a group of cells releases specific chemicals, which regulates the activities of other cell of the body.”

2. DEFINITIONEndocrine glands are organs in thebody that produce hormones whichare released directly into thebloodstream. Together these glandsmake up the endocrine system, whichperforms essential functions likeregulating metabolism, growth andreproduction.

3.  Endocrine derives from the Greek words endo meaning inside, within, and crinis for secrete Chemicals are released by these glands(hormones) hormone derived from Greek word which means „to excite’ The field of study dealing with the endocrine system and its disorders is endocrinology, a branch of internal medicine. In animals glands are of two types Exocrine gland: release products (enzymes) into DUCTS › Ex) Sweat, digestive juices Endocrine glands:– directly to bloodstream; NO DUCTS › Ex) HormonesFeatures of endocrine gland: their ductless nature their vascularity, the presence of intracellular vacuoles or granules storing their hormones.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.