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Biology – Zoology

Chemical Coordination and Integration

Chemical Coordination and Integration

Action PlanNotesQuestionsMock-Test
Study Action Plan (Sorted by Difficulty)
Pancreatic Hormones
Accuracy: 71%
Total Attempted17
Total Correct12
Total Incorrect5
Difficulty Level:
Medium
Adrenal Gland
Accuracy: 74%
Total Attempted19
Total Correct14
Total Incorrect5
Difficulty Level:
Medium
Thyroid and Parathyroid Glands
Accuracy: 76%
Total Attempted21
Total Correct16
Total Incorrect5
Difficulty Level:
Low
Mechanism of Hormone Action
Accuracy: 87%
Total Attempted15
Total Correct13
Total Incorrect2
Difficulty Level:
Low
Hypothalamus and Pituitary Gland
Accuracy: 89%
Total Attempted28
Total Correct25
Total Incorrect3
Difficulty Level:
Low
Hormones of Heart, Kidney, and Gastrointestinal Tract
Accuracy: 92%
Total Attempted12
Total Correct11
Total Incorrect1
Difficulty Level:
Low
Endocrine Glands and Hormones
Accuracy: 100%
Total Attempted17
Total Correct17
Total Incorrect0
Difficulty Level:
Low
Gonadal Hormones
Accuracy: 100%
Total Attempted12
Total Correct12
Total Incorrect0
Difficulty Level:
Low
Human Endocrine System
Accuracy: 100%
Total Attempted14
Total Correct14
Total Incorrect0
Difficulty Level:
Low

Learning Objectives

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Learning Objectives

  • Define exocrine and endocrine glands.
  • Explain the role of hormones in chemical coordination and integration.
  • Identify the major endocrine glands in the human body.
  • Describe the functions of hormones secreted by the hypothalamus, pituitary, thyroid, parathyroid, adrenal glands, pancreas, testis, ovary, thymus, atrium, kidney, and gastrointestinal tract.
  • Discuss the mechanism of action of hormones, including the role of hormone-receptor complexes.
  • Differentiate between peptide, steroid, iodothyronine, and amino-acid derivative hormones.
  • Analyze the physiological effects of major hormones on target tissues.

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Revision Notes & Summary

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Chapter 19: Chemical Coordination and Integration

19.1 Endocrine Glands and Hormones

  • Definition of Hormones: Non-nutrient chemicals acting as intercellular messengers, produced in trace amounts by endocrine glands.
  • Types of Hormones:
    • Peptide, polypeptide, protein hormones (e.g., insulin, glucagon)
    • Steroids (e.g., cortisol, testosterone)
    • Iodothyronines (thyroid hormones)
    • Amino-acid derivatives (e.g., epinephrine)

19.2 Human Endocrine System

  • Major Endocrine Glands:
    • Hypothalamus
    • Pituitary
    • Pineal
    • Thyroid
    • Parathyroid
    • Adrenal
    • Pancreas
    • Thymus
    • Gonads (Testis and Ovary)

19.2.1 The Hypothalamus

  • Function: Regulates body functions through releasing and inhibiting hormones.
  • Example: Gonadotrophin releasing hormone (GnRH) stimulates pituitary hormone release.

19.2.2 The Pituitary Gland

  • Structure: Divided into adenohypophysis (anterior) and neurohypophysis (posterior).
  • Hormones Produced:
    • Anterior Pituitary: Growth hormone (GH), Prolactin (PRL), Thyroid stimulating hormone (TSH), Adrenocorticotrophic hormone (ACTH), Luteinizing hormone (LH), Follicle stimulating hormone (FSH).
    • Posterior Pituitary: Oxytocin, Vasopressin.

19.3 Hormones of Heart, Kidney, and Gastrointestinal Tract

  • Atrial Natriuretic Factor (ANF): Secreted by the heart, decreases blood pressure.
  • Erythropoietin: Produced by kidneys, stimulates red blood cell formation.
  • Gastrointestinal Hormones:
    • Gastrin: Stimulates gastric acid secretion.
    • Secretin: Stimulates pancreatic secretion of bicarbonate.
    • Cholecystokinin (CCK): Stimulates pancreatic enzyme and bile secretion.
    • Gastric Inhibitory Peptide (GIP): Inhibits gastric secretion and motility.

19.4 Mechanism of Hormone Action

  • Hormone-Receptor Interaction: Hormones bind to specific receptors on target tissues, leading to biochemical changes.
  • Types of Receptors:
    • Membrane-bound receptors (for protein hormones)
    • Intracellular receptors (for steroid hormones)

Exercises

  1. Define the following:
    • Exocrine gland
    • Endocrine gland
    • Hormone
  2. Diagrammatically indicate the location of the various endocrine glands in our body.
  3. List the hormones secreted by the following:
    • Hypothalamus
    • Pituitary
    • Thyroid
    • Parathyroid
    • Adrenal
    • Pancreas
    • Testis
    • Ovary
    • Thymus
    • Atrium
    • Kidney
    • G-I Tract
  4. Fill in the blanks for hormones and their target glands.
  5. Write short notes on the functions of:
    • Parathyroid hormone (PTH)
    • Thyroid hormones
    • Thymosins
    • Androgens
    • Estrogens
    • Insulin and Glucagon
  6. Give examples of:
    • Hyperglycemic and hypoglycemic hormones
    • Hypercalcemic hormone
    • Gonadotrophic hormones
    • Progestational hormone
    • Blood pressure lowering hormone
    • Androgens and estrogens
  7. Identify hormonal deficiencies responsible for:
    • Diabetes mellitus
    • Goitre
    • Cretinism
  8. Briefly mention the mechanism of action of FSH.
  9. Match the hormones with their respective glands.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

Insulin

B.

Cortisol

C.

Epinephrine

D.

Glucagon
Correct Answer: B

Solution:

Cortisol, a steroid hormone, interacts with intracellular receptors, often nuclear receptors, to regulate gene expression by forming a hormone-receptor complex that interacts with the genome.

Chapter Concept:

Mechanism of Hormone Action

A.

Growth Hormone (GH)

B.

Prolactin (PRL)

C.

Oxytocin

D.

Thyroid Stimulating Hormone (TSH)
Correct Answer: C

Solution:

Oxytocin is synthesized by the hypothalamus and stored and released by the neurohypophysis.

Chapter Concept:

Hypothalamus and Pituitary Gland

A.

To transport hormones from the posterior pituitary to the hypothalamus

B.

To carry releasing and inhibiting hormones from the hypothalamus to the anterior pituitary

C.

To connect the adrenal gland to the pituitary

D.

To transport oxytocin and vasopressin to the anterior pituitary
Correct Answer: B

Solution:

The hypothalamic-pituitary portal system carries releasing and inhibiting hormones from the hypothalamus to the anterior pituitary, regulating its hormone secretion.

Chapter Concept:

Hypothalamus and Pituitary Gland

A.

Zona glomerulosa

B.

Zona fasciculata

C.

Zona reticularis

D.

Adrenal medulla
Correct Answer: B

Solution:

The zona fasciculata is the middle layer of the adrenal cortex and is primarily responsible for the secretion of glucocorticoids such as cortisol.

Chapter Concept:

Adrenal Gland

A.

By secreting cortisol

B.

By secreting melatonin

C.

By secreting adrenaline

D.

By secreting insulin
Correct Answer: B

Solution:

The pineal gland secretes melatonin, which is crucial for maintaining the sleep-wake cycle.

Chapter Concept:

Human Endocrine System

A.

Thyroid Stimulating Hormone (TSH)

B.

Adrenocorticotrophic Hormone (ACTH)

C.

Follicle Stimulating Hormone (FSH)

D.

Luteinizing Hormone (LH)
Correct Answer: B

Solution:

Adrenocorticotrophic Hormone (ACTH) stimulates the synthesis and secretion of glucocorticoids from the adrenal cortex.

Chapter Concept:

Endocrine Glands and Hormones

A.

Gonadotropin-releasing hormone (GnRH)

B.

Somatostatin

C.

Thyrotropin-releasing hormone (TRH)

D.

Corticotropin-releasing hormone (CRH)
Correct Answer: B

Solution:

Somatostatin inhibits the release of growth hormone from the pituitary gland.

Chapter Concept:

Hypothalamus and Pituitary Gland

A.

Insulin

B.

Glucagon

C.

Somatostatin

D.

Thyroxine
Correct Answer: B

Solution:

Glucagon is secreted by the alpha cells of the pancreas and it increases blood glucose levels by stimulating glycogenolysis and gluconeogenesis.

Chapter Concept:

Pancreatic Hormones

A.

Cortisol

B.

Aldosterone

C.

Epinephrine

D.

Insulin
Correct Answer: B

Solution:

Aldosterone, a mineralocorticoid produced by the adrenal cortex, regulates the balance of water and electrolytes in the body.

Chapter Concept:

Adrenal Gland

A.

Somatostatin

B.

Gonadotropin-releasing hormone (GnRH)

C.

Thyrotropin-releasing hormone (TRH)

D.

Corticotropin-releasing hormone (CRH)
Correct Answer: B

Solution:

Gonadotropin-releasing hormone (GnRH) from the hypothalamus stimulates the pituitary to release gonadotropins.

Chapter Concept:

Hypothalamus and Pituitary Gland

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Chemical Coordination and Integration

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True or False

Correct Answer: False

Solution:

Thyrocalcitonin, also known as calcitonin, is a hormone secreted by the thyroid gland that decreases blood calcium levels.

Chapter Concept :

Endocrine Glands and Hormones

Correct Answer: False

Solution:

After ovulation, the corpus luteum in the ovary primarily produces progesterone, not estrogen. Estrogen is mainly synthesized by the growing ovarian follicles before ovulation.

Chapter Concept :

Gonadal Hormones

Correct Answer: True

Solution:

Leydig cells, located in the interstitial spaces of the testis, produce androgens, primarily testosterone, which regulate the development and function of male secondary sexual characteristics and reproductive organs.

Chapter Concept :

Gonadal Hormones

Correct Answer: False

Solution:

The adrenal medulla secretes catecholamines such as epinephrine and norepinephrine, not glucocorticoids. Glucocorticoids like cortisol are secreted by the adrenal cortex.

Chapter Concept :

Adrenal Gland

Correct Answer: True

Solution:

The pineal gland secretes melatonin, which plays a crucial role in regulating the 24-hour (diurnal) rhythm of the body, including the sleep-wake cycle.

Chapter Concept :

Human Endocrine System

Correct Answer: True

Solution:

Hormones that bind to membrane-bound receptors typically do not enter the target cell. Instead, they generate second messengers such as cyclic AMP, which mediate cellular responses.

Chapter Concept :

Mechanism of Hormone Action

Correct Answer: False

Solution:

Oxytocin and vasopressin are stored and released by the neurohypophysis, not the adenohypophysis.

Chapter Concept :

Hypothalamus and Pituitary Gland

Correct Answer: False

Solution:

Gigantism is caused by an over-secretion of growth hormone during childhood, while Acromegaly occurs due to excess growth hormone in adults.

Chapter Concept :

Hypothalamus and Pituitary Gland

Correct Answer: False

Solution:

Oxytocin and vasopressin are synthesized by the hypothalamus and stored in the posterior pituitary gland.

Chapter Concept :

Hypothalamus and Pituitary Gland

Correct Answer: True

Solution:

Hormones that bind to membrane-bound receptors, such as peptide hormones, usually do not enter the target cell. Instead, they generate second messengers like cyclic AMP, which then mediate the cellular response.

Chapter Concept :

Mechanism of Hormone Action

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