Question

How many of these hormones are lipid soluble? FSH, LH, Iodothyronine, Epinephrine, Aldosterone, Progesterone.
A. Two
B. Three
C. Four
D. One

Answer 1

Lipid soluble molecules are those that can be dissolved in fats rather than in water. Follicular stimulating hormone and luteinizing hormone is gonadotropin hormone made in the pituitary gland. These hormones stimulate female sexual character. Steroid hormones have smaller size and lipo-solubility they can easily diffuse through the target cell.

Complete step by step answer: Hormones are the chemicals secreted from glands.The ductless glands which secrete hormones directly into the bloodstream are known as endocrine glands. Luteinizing hormone works with follicle stimulating hormone made in the pituitary gland. These are gonadotropin hormones which help to stimulate gonads functions in male and female.
Iodothyronines are formed from two molecules of DIT to form thyroxine (T4) while the coupling of one DIT and MIT molecule to form triiodothyronine(T3). These are present in human plasma. They are produced by thyroid and are highly hydrophobic. It is lipophilic in nature but they do not cross membranes.
Adrenaline hormone is also known as epinephrine which is also used as medicine. Adrenal gland produces this hormone. It is mainly secreted in emergency situations therefore it is called an emergency hormone. It mediates short term response to stress.
Aldosterone is a steroid hormone. Its main role in the body is to regulate salt and water. It also affects the blood pressure. It is produced by the outer cortex of the adrenal gland. It is a lipid soluble hormone.
Progesterone is a steroid hormone. It is secreted by a temporary endocrine gland that is corpus luteum. It plays an important role in maintaining the uterine wall or endometrial for the potential of pregnancy after ovulation. It is a lipid soluble hormone.
From the information we have found those steroid hormones that are Progesterone and Aldosterone are soluble in lipid.
So, the correct answer is option A.

Note: Protein hormones have a larger weight about 5000 Daltons and therefore they cannot penetrate the cells, they need membrane receptors. Protein hormones are water-soluble and circulate freely in the blood. Steroids hormone can only circulate in the bloodstream when it is bound to non-specific proteins like albumin.