Endocrine Glands & Hormones — NEET Biology MCQs with Solutions
Free NEET Biology Endocrine Glands & Hormones MCQs with step-by-step solutions (6 questions). Part of Chemical Coordination and Integration. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Endocrine Glands & Hormones · easy · theory
Ductless glands that secrete their products (hormones) directly into the blood are called:
A. Sweat glands
B. Endocrine glands ✓ Correct
C. Exocrine glands
D. Salivary glands
Solution: Endocrine glands lack ducts and release hormones into the blood; exocrine glands (e.g. salivary) have ducts.
Q2 — Endocrine Glands & Hormones · easy · theory
Chemical messengers secreted in small amounts that regulate distant target organs are called:
A. Hormones ✓ Correct
B. Enzymes
C. Vitamins
D. Antibodies
Solution: Hormones are non-nutrient chemical messengers acting on specific target tissues bearing receptors.
Q3 — Endocrine Glands & Hormones · medium · theory
Hormones act only on target cells because those cells possess specific:
A. Ducts
B. Enzymes only
C. More mitochondria
D. Receptors for the hormone ✓ Correct
Solution: A hormone affects only cells with the matching receptor (membrane-bound or intracellular).
Q4 — Endocrine Glands & Hormones · medium · theory
The gland that is both an endocrine and an exocrine gland (a "heterocrine" gland) is the:
A. Thyroid
B. Adrenal
C. Pituitary
D. Pancreas ✓ Correct
Solution: The pancreas secretes digestive enzymes (exocrine) and hormones like insulin/glucagon (endocrine).
Q5 — Endocrine Glands & Hormones · hard · theory
Protein/peptide hormones (e.g. insulin) act via membrane receptors and ______, whereas steroid hormones act by ______:
A. Digestion; osmosis
B. Being stored in the cell wall; diffusion
C. Entering the nucleus directly; second messengers
D. Second messengers (e.g. cyclic AMP); entering the cell and regulating gene expression ✓ Correct
Solution: Peptide hormones bind surface receptors and use second messengers; lipid-soluble steroids enter cells and modulate transcription.
Q6 — Endocrine Glands & Hormones · hard · theory
The organs like the heart, kidney and gastrointestinal tract are considered part of the diffused endocrine system because they:
A. Have ducts
B. Only produce enzymes
C. Store hormones
D. Also produce hormones (e.g. ANF, erythropoietin, gastrin) though not classical endocrine glands ✓ Correct
Solution: Non-endocrine organs secrete hormones too — heart (ANF), kidney (erythropoietin/renin), gut (gastrin, secretin).