Biology
Chemical Coordination and Integration
रासायनिक समन्वय एवं एकीकरण
This Class 11 Biology chapter explains how the endocrine system coordinates body functions through hormones and chemical signals. Students learn about major endocrine glands, including the hypothalamus, pituitary, thyroid, parathyroid, adrenal glands, pancreas, pineal gland, thymus and gonads, along with the roles of their hormones. The chapter also introduces hormone action, feedback regulation, growth, metabolism, reproduction and common endocrine disorders, helping students understand how the body maintains internal balance.
1Endocrine glands and hormones
अंतःस्रावी ग्रंथियाँ और हार्मोन
In this Class 11 Biology topic from “Chemical Coordination and Integration,” students learn how endocrine glands release hormones into the bloodstream to regulate body functions. The topic introduces major glands such as the hypothalamus, pituitary, thyroid, parathyroid, adrenal glands, pancreas, and gonads, along with key hormones and their roles in growth, metabolism, stress responses, reproduction, and internal balance. Students also explore feedback regulation and understand how hormonal coordination differs from nervous control.
0 questionsMechanism of hormone action
हार्मोन की क्रिया का तंत्र
In this Class 11 Biology topic from the chapter Chemical Coordination and Integration, students learn how hormones produce specific responses in target cells. The topic explains the role of hormone receptors, cell-surface receptors and intracellular receptors, along with second-messenger pathways and changes in gene expression. It also shows how hormone–receptor binding regulates processes such as metabolism, growth, development and reproduction, helping students understand communication between endocrine glands and body tissues.
0 questionsHypothalamus
हाइपोथैलेमस (अधश्चेतक)
Study the hypothalamus in Class 11 Biology as part of Chemical Coordination and Integration. This topic explains how the hypothalamus connects the nervous and endocrine systems, produces releasing and inhibiting hormones, and regulates pituitary gland activity. Students also learn its role in maintaining homeostasis through control of body temperature, hunger, thirst, water balance, sleep and other essential functions. The topic shows how neural signals and hormones work together to coordinate internal processes.
0 questionsPituitary
पीयूष ग्रंथि (पिट्यूटरी ग्रंथि)
In Class 11 Biology, the Pituitary topic from “Chemical Coordination and Integration” explains how this small endocrine gland regulates major body functions through hormones. Students learn about the anterior and posterior pituitary, its connection with the hypothalamus, and hormones such as growth hormone, TSH, ACTH, FSH, LH, prolactin, ADH, and oxytocin. The topic also clarifies how the pituitary influences growth, reproduction, water balance, lactation, and the activity of other endocrine glands.
0 questionsThyroid
थायरॉइड ग्रंथि
In Class 11 Biology, this topic explains the thyroid gland as an important endocrine gland involved in chemical coordination and integration. Students learn how it produces thyroid hormones, mainly thyroxine (T4) and triiodothyronine (T3), and how iodine supports their synthesis. The topic connects these hormones with metabolism, body growth, development and energy regulation, while introducing feedback control through the hypothalamus and pituitary gland. It also covers common effects of underactive or overactive thyroid function, including goitre, hypothyroidism and hyperthyroidism.
0 questionsAdrenal
अधिवृक्क ग्रंथि
This Class 11 Biology topic introduces the adrenal glands as important endocrine organs in the chapter Chemical Coordination and Integration. Students learn about the adrenal cortex and medulla, along with the roles of hormones such as cortisol, aldosterone, adrenaline and noradrenaline. The topic explains how these hormones help regulate metabolism, salt-water balance, blood pressure and the body’s response to stress, while connecting adrenal function with coordination and homeostasis.
0 questionsPancreas
अग्न्याशय
In Class 11 Biology, the pancreas is studied as a mixed gland that supports both digestion and chemical coordination. Students learn about its endocrine regions, the Islets of Langerhans, and the hormones insulin and glucagon. These hormones help maintain blood glucose levels through coordinated feedback and opposing actions. The topic also introduces how impaired insulin production or action can lead to diabetes mellitus, linking pancreatic function with homeostasis and human health.
0 questionsGonads
जनन ग्रंथियाँ
In this Class 11 Biology topic from Chemical Coordination and Integration, students learn how gonads—the testes in males and ovaries in females—function as both reproductive organs and endocrine glands. The topic explains the hormones they secrete, including testosterone, oestrogen and progesterone, and their roles in puberty, development of secondary sexual characteristics, gamete formation and reproductive functions. Students also connect gonadal activity with hormonal regulation and coordination in the human body.
0 questions