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CBSE Class 11 · Biology

Chemical Coordination and Integration

Official NCERT chapter from Biology (book code kebo1). ExamMaster notes are original teaching at CBSE Class 11 depth.

This lesson follows the official chapter “Chemical Coordination and Integration” in Biology. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.

  • CBSE Class 11
  • Medium level
  • 8 concepts

1Endocrine Glands and Hormones

Endocrine glands and hormones: a ductless gland releases a chemical signal into blood as taught. Hormone is that blood-signal; gland is the source. Stage-names and named jobs only — no extra private how-to. Insulin / growth / a thyroid mention as the lesson listed.

A vitamin-pill as a hormone because both are “chemicals” is a miss.

Figure. An endocrine gland has no duct. The hormone it makes rides in blood and acts only at a matching target.

How it works

  1. Name ductless + blood-signalEndocrine / hormone.
  2. Attach one taught jobThe use.
  3. Stay on named jobs — no extra how-toSchool-size.

2Human Endocrine System

Human endocrine system: the taught gland-list (pituitary, thyroid, adrenal, pancreas, gonads as listed) each with one job-sentence. Human is the map, not a clinic-manual. One job per gland is enough.

A ten-drug list as the system is the wrong size.

Figure. Exam maps name glands from head to pelvis. Each box is a job, not a drawing of the body.

How it works

  1. Name the glandThe source.
  2. Give one school jobThe map.
  3. Refuse a treatment-manualThis class.

3Hormones of Heart, Kidney and Gastrointestinal Tract

Hormones of heart, kidney and gastrointestinal tract: extras besides the classic glands as taught — a named heart/kidney/gut signal. Extra is still a blood-cue, not a vitamin. One name each if listed.

Skipping these because “only big glands count” hides the heading.

Figure. Heart, kidney, and gut also make hormones. ANF, erythropoietin, and gastrin are the Class 11 names.

How it works

  1. Name the taught extra sourceHeart, kidney, or gut.
  2. Attach the school cueThe hormone-job.
  3. Keep it a signal, not a foodHonest.

4Mechanism of Hormone Action

Mechanism of hormone action: a receptor-fit as taught — the cell that has the receptor hears the signal. Mechanism is fit-and-cue, not a second gland-list. Membrane versus inner receptor if split. School-size only.

A “try harder” slogan as the mechanism is a miss.

Figure. Peptides stop at the membrane and use a second messenger. Steroids enter and act on genes. Same blood ride; two doors.

How it works

  1. Name hormone + receptor on the targetThe fit.
  2. Say the cell then changes a jobThe action.
  3. Refuse a slogan as the howA fit-word.

5A hormone is a chemical signal in blood

A hormone is a chemical signal in blood: tiny amount, a named target, a job-change as taught. Hormone is the signal-word, not a nutrient. Stage-names only.

Sugar as “a hormone” because blood carries it is a miss.

Figure. The hormone is a blood-borne signal. Only a cell with the matching receptor is the target. Other cells ignore it.

How it works

  1. Name blood-signal + target + jobThe hormone.
  2. Keep nutrient as a different wordFood ≠ signal.
  3. Stay on stage-namesThis class.

6A gland has a job you can name

A gland has a job you can name: pituitary as a master-cue if taught, thyroid as a rate-cue, pancreas as a sugar-cue — as the lesson framed each. Gland is name-plus-job. A mute labelled blob is not this heading.

A “gland” sticker with no job is a miss.

Figure. Name the gland by the job: thyroid makes thyroxine, which sets how fast the body uses food. A label without a job is a glossary.

How it works

  1. Name the glandThe word.
  2. Attach the school jobWhy it sits.
  3. Refuse a name-only claimJob-talk.

7A miss: treating a hormone as a vitamin

A miss: treating a hormone as a vitamin. A vitamin is a food-helper; a hormone is a made-here signal. Mixing the two words is the leftover this heading names.

A pill-bottle labelled hormone as the whole science is the miss.

Figure. A hormone is made in the body and sent in blood. A vitamin is taken in food. Sharing a chemical name does not make them the same job.

How it works

  1. Keep hormone as blood-signalMade-here cue.
  2. Keep vitamin as a food-helper if askedThe other word.
  3. Refuse a pill-swap as the chapterThe miss named.

8Keep the claim at this class

Keep the claim at this class: named glands, named jobs, a receptor-fit. It is not a medical lecture and not a rumour. Reproduction-jobs stay as stage-names if listed — no extra private how-to.

A film or a rumour as “the endocrine chapter” is the wrong size.

Figure. Hold the Class 11 map: named glands and the job of each hormone. Later-exam exception lists are a different claim.

How it works

  1. Stay on named glands and jobsThis class.
  2. Keep stage-names only if a reproduce-job was listedHonest.
  3. Refuse a lecture or a rumourThe claim-size.
A hormone here is
  1. A chemical signal in blood as taught
  2. A vitamin-pill
  3. A bone-name

A blood-cue.

Notes

  • Mapped to the official NCERT chapter “Chemical Coordination and Integration”. Original teaching only — no textbook sentences.
  • Science here is Physics, Chemistry and Biology ideas at this class, never a language or social-science chapter.

Recap

Hold these pegs from the official chapter “Chemical Coordination and Integration”. The wording is ExamMaster’s teaching, not a textbook recap.

Endocrine Glands and Hormones
Endocrine glands and hormones: a ductless gland releases a chemical signal into blood as taught.
Human Endocrine System
Human endocrine system: the taught gland-list (pituitary, thyroid, adrenal, pancreas, gonads as listed) each with one job-sentence.
Hormones of Heart, Kidney and Gastrointestinal Tract
Hormones of heart, kidney and gastrointestinal tract: extras besides the classic glands as taught — a named heart/kidney/gut signal.
Mechanism of Hormone Action
Mechanism of hormone action: a receptor-fit as taught — the cell that has the receptor hears the signal.
A hormone is a chemical signal in blood
A hormone is a chemical signal in blood: tiny amount, a named target, a job-change as taught.
A gland has a job you can name
A gland has a job you can name: pituitary as a master-cue if taught, thyroid as a rate-cue, pancreas as a sugar-cue — as the lesson framed each.

Practise Chemical Coordination and Integration

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