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PUCET (Punjab) Chemical Coordination and Integration — practice questions

Explore 7 free Chemical Coordination and Integration questions in PUCET (Punjab) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Coordination and Integration questions and exercises with answers

Showing questions 1–7 of 7.

The endocrine system uses ___ to coordinate body functions.Read the answer and worked solution →Thyroid hormones T3 and T4 contain which element?Read the answer and worked solution →Insulin is secreted by:Read the answer and worked solution →Hypothalamus secretes releasing and inhibiting hormones that act on:Read the answer and worked solution →Growth Hormone (GH) excess in childhood causes:Read the answer and worked solution →Cortisol secretion peaks in the:Read the answer and worked solution →Estrogen and progesterone, secreted mainly by ovaries during reproductive cycle, are:Read the answer and worked solution →

Worked practice questions

The endocrine system uses ___ to coordinate body functions.

  1. Hormones (chemical messengers secreted into blood)
  2. Nerves
  3. Neurotransmitters only
  4. Salts
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Correct answer: A. Hormones (chemical messengers secreted into blood)

**Endocrine system:** ductless glands secrete hormones directly into bloodstream. Hormones reach target cells with specific receptors. Slower but more sustained action than nervous system. Two systems coordinate together (neuroendocrine integration).

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Thyroid hormones T3 and T4 contain which element?

  1. Iron
  2. Iodine (3 atoms in T3, 4 in T4)
  3. Calcium
  4. Sulfur
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Correct answer: B. Iodine (3 atoms in T3, 4 in T4)

T3 = triiodothyronine, T4 = thyroxine (tetraiodothyronine). Both contain iodine. Made from tyrosine + iodine in thyroid follicles. T3 more active. Iodine deficiency → goiter, hypothyroidism. Iodized salt prevents deficiency.

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Insulin is secreted by:

  1. Alpha cells of pancreas
  2. Liver
  3. Beta cells of pancreatic islets of Langerhans
  4. Acinar cells
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Correct answer: C. Beta cells of pancreatic islets of Langerhans

Islets of Langerhans (endocrine pancreas, ~2% of pancreatic mass) contain: α cells (glucagon), β cells (insulin), δ cells (somatostatin), F/PP cells (pancreatic polypeptide). Acinar cells are exocrine (digestive enzymes).

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