Question

The chemical messengers produced in ductless glands are:
A.vitamins
B.lipids
C.antibiotics
D.hormones

Answer 1

Hint: Chemical messengers are the compounds that are involved in transmitting signals inside the cells. Chemical messengers are of different types according to the range of their effect. They can be long range transporting through blood to the site of action, example hormones. They can act on adjacent cells, example neurotransmitters, and even act on their own cells from where they are released and are known as autocrine.

Complete step by step answer:
In order to select the correct option we will study about each option given:
Vitamins: They are essential organic macronutrients required by the body for the proper growth pattern of the body of an individual. They are categorized as essential and non-essential vitamins. The ones which are synthesized within the body of an individual are known as non-essential and the vitamins taken in the diet from outsource are known as essential vitamins, they cannot be synthesised in the body of an individual.
Lipids: They are organic molecules which are insoluble in water and only soluble in nonpolar solvents such as benzene or chloroform. They have the function of storage, act as fuel, and provide the structural component to the membrane.
Antibiotics: It is defined as the antimicrobial agents that act against the bacteria in the human body, by eliminating it or by stopping the multiplication of the bacteria inside the body of an individual, example: penicillin was the first antibiotic discovered, ciprofloxacin etc.
Hormones: Hormones are the protein molecules acting as signal messengers, which are directly secreted into the bloodstream by the ducts of the glands to be carried to the site to action. Example: insulin, progesterone, prolactin and serotonin.
Endocrine glands: It forms the regulatory system constituting ductless glands which secretes their secretion directly into the bloodstream and these secretions are known as hormones.
Thus the correct option is D, i.e. hormones act as chemical messengers produced in ductless glands.


Note:
The human body has various endocrine glands release their secretions into the bloodstream: Parathyroid, Adrenals, Pineal body, Pituitary, The ovaries, Hypothalamus, Thyroid, the testes. Hence, the hormones secreted by all these glands act as controlling, coordinating and messenger agents in the body.