Human Endocrine System

Estrogen suppresses lactation.

This option is correct because the insulin is the peptide hormones produced by the beta cells in pancreas. It regulates the metabolism of carbohydrates and fats by promoting the adsorption of glucose.

The ovaries stop producing estrogen and progesterone at menopause.

Follicle Stimulating Hormone governs all changes in post-menstrual phase.

Ovulation is controlled by LH.

Fall in levels of estrogen and progesterone stimulates the secretion of FSH and LH.

Progesterone level rises rapidly from 15^th day onwards for 7 days and then, declines at very low level.

The pineal hormone melatonin is involved in controlling biological rhythms and photoperiodism.

Leydig cells in the testis secrete male sex hormone testosterone.

Endocrine glands secrete hormones directly into the bloodstream to regulate body functions. Plasma cells produce antibodies, salivary glands produce saliva (exocrine), and prostate glands produce fluid for semen (exocrine). Only endocrine glands are primarily defined by hormone secretion.

Hormones are non-antigenic. They are secreted into blod prior to use and may be amino acids, amino acid derivatives, steroid, polypeptide or proteins, amines or glycoprotein.  

The testes of the male begin to produce testosterone at puberty in response to LH. Progesterone is released by ovary in response to high blood levels of LH.

When two hormones work together these are known as synergesic hormone. Ex. – FSH and LH.

Thymosin controls growth in childhood.

Testosterone is a steroid hormone from the androgen group and is found in humans and other vertebrates.