Solve this :
2. Give the characteristics of hormones pertaining to
(i) Site of action............................................
(ii) Chemical nature......................................
(iii) Manner of transportation.......................
Dear student,
(1) Site of action: Hormones are carried by the blood throughout the entire body, yet they affect only certain cells. The specific cells that respond to a given hormone have receptor sites for that hormone. This is sort of a lock-and-key mechanism.
(2) Chemical Nature of Hormones: Chemically, hormones may be classified as either proteins or steroids. All of the hormones in the human body, except the sex hormones and those from the adrenal cortex, are proteins or protein derivatives.
(3) Manner of transportation: Endocrine hormones are secreted into the blood and carried by blood and tissue fluids to the cells they act upon, while exocrine hormones are secreted into a duct, and then into the bloodstream. Exocrine hormones are transferred from cell to cell by diffusion.
Regards.
(1) Site of action: Hormones are carried by the blood throughout the entire body, yet they affect only certain cells. The specific cells that respond to a given hormone have receptor sites for that hormone. This is sort of a lock-and-key mechanism.
(2) Chemical Nature of Hormones: Chemically, hormones may be classified as either proteins or steroids. All of the hormones in the human body, except the sex hormones and those from the adrenal cortex, are proteins or protein derivatives.
(3) Manner of transportation: Endocrine hormones are secreted into the blood and carried by blood and tissue fluids to the cells they act upon, while exocrine hormones are secreted into a duct, and then into the bloodstream. Exocrine hormones are transferred from cell to cell by diffusion.
Regards.