Types of Regulatory Molecules (Paracrine Regulation (Immune system. ( ),…
Types of Regulatory Molecules
the axons of neurons secrete
chemical messengers called neurotransmitters into the synaptic cleft
A hormone is a regulatory chemical that is secreted into
the blood by an endocrine gland or an organ of the body
exhibiting an endocrine function.
the chemical that the neurons secrete is sometimes called a neurohormone.
Endocrine Glands and Hormones
These hormones are composed of
chains of amino acids that are shorter than about
100 amino acids.
These are composed of a polypeptide
significantly longer than 100 amino acids to
which is attached a carbohydrate. Examples include
follicle-stimulating hormone (FSH) and luteinizing
Derived from the amino acids tyrosine and
tryptophan, they include hormones secreted by the
adrenal medulla, thyroid, and pineal glands.
These hormones are lipids derived from
cholesterol, and include the hormones testosterone,
estradiol, progesterone, and cortisol.