Previous Year Papers NEET Biology Class 11 – Chemical Coordination and Integration

Chemical Coordination and Integration is a crucial chapter of NEET Biology Class 11 that explains the structure and function of endocrine glands, types of hormones, mechanisms of hormonal action, and feedback regulation. Mastering this chapter is essential for answering both theoretical and diagram-based NEET questions.

NEET previous year papers frequently include questions on endocrine glands, hormone functions, feedback mechanisms, and interactions between nervous and endocrine systems. Practicing PYQs helps students strengthen understanding of hormonal regulation. Studentbro.in provides exam-focused content for effective preparation.

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Endocrine Glands – NEET PYQ Focus

Endocrine glands are ductless glands that secrete hormones directly into the bloodstream. Major glands include:

• Pituitary Gland – Regulates growth, thyroid, adrenal, and reproductive glands.

• Thyroid Gland – Produces thyroxine, regulates metabolism and growth.

• Parathyroid Gland – Controls calcium and phosphate balance.

• Adrenal Glands – Produce corticosteroids and catecholamines for stress response.

• Pancreas (Islets of Langerhans) – Secretes insulin and glucagon for glucose regulation.

• Gonads (Ovary and Testis) – Produce sex hormones for reproduction.

NEET PYQs often test gland location, hormones secreted, and physiological functions.

Types of Hormones – Important NEET Concepts

Hormones can be classified by chemical nature:

• Peptide Hormones – Insulin, glucagon; water-soluble, act via second messengers.

• Steroid Hormones – Cortisol, estrogen; lipid-soluble, act via intracellular receptors.

• Amino Acid Derivatives – Thyroxine, epinephrine; water-soluble or lipid-soluble.

Previous year papers frequently ask about hormone classification, examples, and mode of action.

Mechanism of Hormone Action

Hormones act on specific target cells and organs. Mechanisms include:

• Membrane Receptor-Mediated – For water-soluble hormones using second messengers (cAMP).

• Intracellular Receptor-Mediated – For lipid-soluble hormones affecting gene transcription.

NEET questions often include steps of hormone action and signal transduction pathways.

Feedback Mechanisms in Endocrine System

Hormonal regulation is mainly controlled by negative feedback. For example:

• High thyroxine inhibits TSH from pituitary.

• Low blood glucose stimulates glucagon release; high glucose stimulates insulin.

Positive feedback is less common, e.g., oxytocin during childbirth. NEET PYQs often test feedback loops and physiological significance.

Interaction Between Nervous and Endocrine Systems

Neural and hormonal systems work together to maintain homeostasis. The hypothalamus controls pituitary hormones, linking nervous system signals to endocrine responses.

Previous year papers may ask about hypothalamus-pituitary axis, hormone regulation, and stress response mechanisms.

Disorders of Endocrine System

Common disorders include:

• Hyperthyroidism / Hypothyroidism – Thyroid hormone imbalance.

• Diabetes Mellitus – Insulin deficiency or resistance.

• Cushing’s Syndrome / Addison’s Disease – Adrenal hormone disorders.

NEET questions may include causes, symptoms, and preventive measures.

Importance of Previous Year Papers for NEET Biology

Practicing previous year papers helps students identify frequently asked topics, reinforce conceptual understanding, and improve speed. PYQs for Chemical Coordination and Integration focus on endocrine glands, hormones, mechanisms, and feedback regulation, which are commonly tested in NEET.

Conclusion

Previous Year Papers of NEET Biology Class 11 Chemical Coordination and Integration are essential for mastering endocrine physiology. This chapter requires clear understanding of hormone types, gland functions, feedback mechanisms, and neural-hormonal integration.

Regular practice of PYQs helps students enhance conceptual clarity, diagram interpretation, and confidence in NEET. Studentbro.in provides structured, reliable, and exam-focused content to help NEET aspirants succeed.