Question

Secretion of ductless gland is known as
A. Hormones
B. Pheromones
C. Enzymes
D. Mucoids

Answer 1

Hint: Endocrine system is made up of non-conductive glands in the body. Endocrine glands are organs that look like sweat glands, but there are no ducts connected to them through which secretions are secreted. The secret goes directly into the bloodstream.

Complete answer:
The internal secretions of the endocrine glands are called "hormones".
Hormones are called the body's chemical messengers. These hormones control and regulate growth, increased metabolic activity in various tissues, and many regulatory functions in the body. They play an important role in regulating the functions of various organs that are transmitted through the bloodstream.
Hormones are chemical messengers (which can be proteins, lipids or amines) secreted by special cells of the endocrine glands, they support the physiological activity of target cells through the circulation.
Characteristics of Hormonal secretion in humans:
These are chemical formations formed by special cells of the endocrine glands. They are transported through the bloodstream to target cells / tissues / organs.
The effect of hormones depends on the species. It is produced in very small quantities and is mainly soluble in water but some are also lipid soluble. It has low molecular weight. They were destroyed after the action.
 In terms of chemical composition, they are heterogeneous substances. It cannot be stored for very long. They are usually synthesized and secreted during demand.
They usually form hormone receptor complexes to activate target cells.
Pheromones are chemicals released into the environment that allow the body to communicate with other members of its species.
Enzymes are proteins that are synthesized in living cells and catalyse or accelerate thermodynamically possible reactions so that the reaction rate matches the biochemical processes that are critical for the maintenance of cells. It is sometimes called an organic catalyst or biocatalyst.

Hence from the above points it’s clear that option (A) is correct.

Note: Most hormones enter the bloodstream directly after secretion and can reach target organs through the bloodstream or bind to carrier proteins. Sometimes hormones are carried through body fluids between cells, especially in paracrine secretions. After exposure, the hormone is metabolically degraded. During the metabolism of the hormone, the molecule changes and can be used in the rectum. It usually breaks down in the liver and kidneys and is excreted in the urine. Peptide hormones are digested in the lysosomes and converted into individual amino acids.