NEET Biology Endocrine System Chapter Notes

Here is the NEET Biology Endocrine System Chapter Notes for your studies. Use these Full Course Biology revision notes, created by professional educators for the 2026-27 academic term. They make difficult ideas very easy to understand and focus on core definitions, helping Full Course students prepare quickly before exams.

Download Full Course Biology Endocrine System Notes

Check out these Full Course Biology Endocrine System notes to study important concepts in very little time. These concise summaries target difficult questions and scoring chapters, helping you perform better in school exams and final tests.

Endocrine System Summary & Notes for Full Course Biology

INTRODUCTION : 
 
♦ The branch of biology which deals with the study of endorcine system and its physiology is known as '' Endocrinology''.
 
♦''Thomas Addision'' is known as father of Endocrinology.
Whereas the gland with duct is called exocrine gland which secretes enzyme etc. Endocrine glands pour their secretion directly into blood. These glands lack ducts, so these glands are called ductless glands. 
 
♦ Co-ordination in the body of almost all the higher vertebrates is controlled by two systems Nervous system and endocrine system.
 
♦ Nervous system and endorcine system are called Integrative system of the body.
 
♦ Nervous system carries informations in the form of impulses to the different parts of body. High speed services are offered by this system.
 
♦ Where as, the work of co-ordination by endocrine system is slowly by secretion of some chemical substances.
 
♦ Substances secreted by these glands are known as hormones. The meaning of work 'hormone' in Greek is ''to excite'' = hormaein.
 
Differences between Nervous and Endocrine Coordinations
NEET Biology Endocrine System Chapter Notes
 
HORMONE :

→ The term hormone was coined by Starling. 
→ Hormones are also called ''Primary messengers'' or chemical messengers.'' 
→ First discovered hormone is secretin. It was discovered by Bayliss & Starling in 1902. 
Source & Chemical Nature : - Hormones are chemical messengers which are secreted by one part of body and are poured directly into the blood stream, and they reach at their target place with the help of blood. A small amount of hormone affects some specific cells or physiology of cells of organ according to atmospheric conditions.
 
Chemical Nature of Hormone :

The animal hormones may be classfied into 6 categories.
 
1. Amino acid derivatives : The hormones epinephrine and norepinephrine from the adrenal medulla and thyroxine from the thyroid gland are derived from amino acid.
 
2. Short peptides : The hormones oxytocin and vasopression from the posterior lobe of the pitutary gland are short peptides of 9 amino acid. The melanocyte stimulating hormone (MSH) from the intermediate lobe of the pituitary gland is also short peptide of 13 amino acids.
 
3. Long peptides : The hormones insulin from the pancrease, adrenocortico tropin (ACTH) from the anterior lobe of the pituitary gland, calcitonin from the parathyroid gland consists of 84 amino acids.
 
4. Protein : The gonadotropic, thyrotropic and somatotropic hormones from the anterior lobe of pituitary are protein with high molecular weights.
 
5. Steroids (Fat soluble) : The hormones like cortisol and aldosterone from adrenal cortex, testosterone from interstitial cells of testes, estrogen and progesterone from Graaffian follicles of ovary and placenta are the examples of steroid hormones. The hormones contain cholesterol and bile salts.
 
6. Fatty acid derivative : - Prostaglandin
 
Physical & Chemical Specialities of Hormones : - 

→ The moleucles of most of the hormones are small, and their molecular weight is low.
→ Hormones are soluble in water and are easily diffusible in tissues. 
→ The secretion of hormone is always in very small quantity because these are most reactive substances 
→ Hormones are destroyed after use.
→ Hormones can not be stored in the body except Thyroxine. 
→ Hormones are soluble in water and blood. 
→ Liver and kidneys separate them from blood and decompose them. The waste product formed after decomposition, hormones are excreted with urine. It can not be reutilized. 
→Hormones are non-antigenic & non species specific substances.
→ Usually, hormones do not participate in the metabolic activities of target cells but they affect and control the activity level of these target cells. Due to the effect of hormones, not only the rate of metabolic activites is effected but also the permeability of cell membrane is changed so the nature of reaction is also changed. so the nature of reaction is also changed.
NEET Biology Endocrine System Chapter Notes1
 
NEET Biology Endocrine System Chapter Notes2
 

Free study material for Biology

Revision Notes & Key Concepts for Full Course Biology Endocrine System

NEET Full Course Biology Endocrine System Notes

Utilize these Revision Notes for Endocrine System to accelerate your exam readiness. Formatted under recent NEET guidelines for Full Course, these summaries focus on critical curriculum components. Regular revision of these core points leads to superior performance in school tests.

Important Chapter Summary & Solutions for Endocrine System

Our expert team has used the official NCERT book for Full Course Biology to design these notes. These are the notes that definitely help you for your current academic year. After reading the chapter summary, you should also refer to our NCERT solutions for Full Course. Always compare your understanding with our teacher-prepared answers as they will help you build a very strong base in Biology.

Master Full Course Biology with Extra Practice Sets

To prepare very well for your exams, students should also solve the MCQ questions and practice worksheets provided on this page. These extra solved questions will help you to check if you have understood all the concepts of Endocrine System. All study material on our platform is free and updated according to the latest Biology exam patterns. Using these revision notes daily will help you feel more confident and get better marks in your exams.

FAQs

Where can I download the latest PDF for NEET Biology Endocrine System Chapter Notes?

You can download the teacher prepared revision notes for NEET Biology Endocrine System Chapter Notes from StudiesToday.com. These notes are designed as per 2026-27 academic session to help Full Course students get the best study material for Biology.

Are these Biology notes for Full Course based on the 2026 board exam pattern?

Yes, our NEET Biology Endocrine System Chapter Notes include 50% competency-based questions with focus on core logic, keyword definitions, and the practical application of Biology principles which is important for getting more marks in 2026 NEET exams.

Do these Full Course notes cover all topic-wise concepts for Biology?

Yes, our NEET Biology Endocrine System Chapter Notes provide a detailed, topic wise breakdown of the chapter. Fundamental definitions, complex numerical formulas and all topics of NEET syllabus in Full Course is covered.

How can I use NEET Biology Endocrine System Chapter Notes for quick last-minute revision?

These notes for Biology are organized into bullet points and easy-to-read charts. By using NEET Biology Endocrine System Chapter Notes, Full Course students fast revise formulas, key definitions before the exams.

Is there any registration required to download Full Course Biology notes?

No, all study resources on StudiesToday, including NEET Biology Endocrine System Chapter Notes, are available for immediate free download. Full Course Biology study material is available in PDF and can be downloaded on mobile.