Q.The steroid responsible for balance of water and electrolytes in our body is
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Adrenal Gland Hormones – From Intuition to Precision
Think of your body as a finely tuned machine that needs to handle both daily stress and sudden emergencies. The adrenal glands sit like tiny caps on top of your kidneys, and they are your body's command centre for managing these situations. They produce hormones that help you either deal with long-term stress (like a tough exam week) or react instantly to danger (like a car swerving toward you).
The gland has two distinct parts: the outer cortex and the inner medulla. Each secretes a different class of hormones with different jobs.
The Cortex – Corticoids (Steroid Hormones)
The adrenal cortex produces corticoids, which are steroid hormones derived from cholesterol. They fall into two main groups.
Glucocorticoids (mainly cortisol) regulate your body's use of glucose, proteins, and fats. When you are under prolonged stress, cortisol raises blood sugar by breaking down proteins and fats, giving you sustained energy. It also suppresses inflammation and the immune response — which is why synthetic cortisol (like hydrocortisone) is used in allergy and arthritis treatments.
Too much cortisol over time (Cushing's syndrome) causes high blood sugar, weight gain, and weakened immunity. Too little (Addison's disease) leads to low blood sugar, fatigue, and poor stress response.
Mineralocorticoids (mainly aldosterone) control the balance of salt and water in your body. Aldosterone tells your kidneys to hold onto sodium and excrete potassium. Where sodium goes, water follows — so aldosterone indirectly regulates blood volume and blood pressure.
Aldosterone→Na+ reabsorption↑→Blood volume↑→Blood pressure↑
The Medulla – Adrenaline and Noradrenaline (Catecholamines)
The adrenal medulla produces adrenaline (epinephrine) and noradrenaline (norepinephrine). These are not steroids — they are derived from the amino acid tyrosine and act much faster than corticoids.
This is your fight-or-flight system. When you face sudden danger, the medulla dumps adrenaline into your bloodstream. Within seconds, your heart beats faster, your airways widen, blood is diverted to muscles, and your liver releases glucose for quick energy. Noradrenaline works similarly but also constricts blood vessels to raise blood pressure.
Adrenaline is the "panic button" — it prepares your entire body for extreme physical effort. That's why it's used in emergency allergy shots (EpiPen) to reverse a severe allergic reaction.
Putting It All Together
| Gland Part | Hormones | Type | Main Function | Speed |
|------------|----------|------|---------------|-------| …
The steroid responsible for the body's water and electrolyte balance is aldosterone, option (D).
- Aldosterone is the main mineralocorticoid secreted by the adrenal cortex.
- It acts mainly on the renal tubules, stimulating reabsorption of sodium ions and water, while promoting excretion of potassium and phosphate ions. …
Aldosterone, the adrenal cortex's principal mineralocorticoid, is the steroid hormone that keeps the body's water and electrolyte levels in balance, so option (D) is correct.
The adrenal cortex secretes a family of steroid hormones called corticoids, which fall into two functional groups. Glucocorticoids, chiefly cortisol, are concerned with carbohydrate metabolism and stress responses. Mineralocorticoids, of which aldosterone is the main example, are the ones dedicated specifically to regulating water and electrolytes. …
- AP EAPCET 2026Set ap-2026-05-19-AN1 markMCQQ.These hormones have effect on protein and carbohydrate anabolism (A) Cortisol (B) Androgens (C) Catecholamines (D) Thyroxine
›Reveal solutionSolution
Androgens (testosterone) are the hormones specifically credited with a significant anabolic effect on protein and carbohydrate metabolism, distinct from the catabolic, glucose-mobilising actions of cortisol and catecholamines.
Concept and Intuition
Testosterone, the principal androgen secreted by Leydig cells of the testis, does far more than drive spermatogenesis and secondary sexual characteristics — it is explicitly noted in reproductive physiology for its anabolic influence on protein metabolism (promoting muscle mass and general body growth, which is why synthetic androgens/anabolic steroids are misused for muscle building) as well as its effect on carbohydrate metabolism. This is different from cortisol and catecholamines, whose defining hormonal roles are largely catabolic and stress-response oriented — cortisol promotes gluconeogenesis and protein breakdown (a catabolic action, the opposite of anabolism) during stress, while catecholamines rapidly mobilise glucose (glycogenolysis) for fight-or-flight energy needs rather than building tissue. Thyroxine regulates overall basal metabolic rate and is essential for normal growth and development, but the specific, commonly cited "anabolic effect on protein and carbohydrate metabolism" phrase in reproductive endocrinology is attributed to androgens/testosterone.
Step-by-Step Solution
- Recall testosterone's documented actions beyond reproduction: significant effect on protein and carbohydrate metabolism (anabolic).
- Contrast with cortisol: primarily catabolic (protein breakdown, gluconeogenesis) under stress — not anabolic. …
- AP EAPCET 2026Set ap-2026-05-20-FN1 markMCQQ.Glucocorticoids are secreted by (A) Zona glomerulosa (B) Zona fasciculata (C) Zona reticularis (D) Zona pellucida
›Reveal solutionSolution
Glucocorticoids (cortisol) are secreted by the middle zone of the adrenal cortex, the zona fasciculata.
Concept and Intuition
The adrenal cortex is organised into three concentric zones from outside in, each dedicated to one hormone class — a mnemonic often used is "GFR" (Glomerulosa-Fasciculata-Reticularis) paired with "salt-sugar-sex" (mineralocorticoids-glucocorticoids-androgens).
Step-by-Step Solution
- Zona glomerulosa (outer zone) secretes mineralocorticoids like aldosterone, regulating sodium/potassium/water balance.
- Zona fasciculata (middle zone) secretes glucocorticoids like cortisol, regulating glucose metabolism, stress response, and having anti-inflammatory effects.
- Zona reticularis (inner zone) secretes small amounts of sex steroids (androgens). …
- AP EAPCET 2021Set ap-2021-09-07-FN1 markMCQQ.Hormone produced against allergic reaction is ___________ (A) Glucocorticoid (B) Mineralo corticoid (C) Nor-epinephrine (D) Epinephrine
›Reveal solutionSolution
The key idea is that the hormone produced to counteract an allergic reaction is epinephrine (adrenaline), which rapidly reverses symptoms like swelling and airway constriction. The correct option is (D).
The question asks which hormone is produced against an allergic reaction. Allergic reactions involve the release of histamine and other mediators from mast cells, causing symptoms like vasodilation, bronchoconstriction, and swelling. The body’s emergency countermeasure is the release of epinephrine (also called adrenaline) from the adrenal medulla. Epinephrine acts quickly to constrict blood vessels (reducing swelling), relax bronchial smooth muscle (opening airways), and raise blood pressure — directly opposing the effects of histamine. This is why epinephrine is the first-line treatment for severe allergic reactions (anaphylaxis).
Let’s examine each option:
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Glucocorticoid (A) — These hormones (e.g., cortisol) reduce inflammation over hours to days by suppressing immune cell activity. They are used for chronic allergies or as a follow-up, but they are not the immediate “fight-or-flight” hormone produced against an acute allergic reaction. They are too slow for the initial response.
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Mineralocorticoid (B) — These (e.g., aldosterone) regulate salt and water balance in the kidneys. They have no direct role in countering allergic reactions.
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Nor-epinephrine (C) — This is a neurotransmitter and hormone similar to epinephrine, but it acts mainly on blood vessels to raise blood pressure. It is less effective at relaxing airways and is not the primary hormone released in allergic emergencies. Epinephrine is far more potent for reversing anaphylaxis. …
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