Free Chemical Coordination and Hormones MCQs with Answers
257 Chemical Coordination and Hormones MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Chemical coordination uses hormones released by endocrine glands and carried in blood to specific target cells. Coverage includes the pituitary, thyroid, pancreas, adrenal glands, ovaries and testes, feedback control, and the contrast between slower, longer-lasting hormonal responses and rapid nervous coordination.
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257 questions · page 7 of 13
- A. FSH
- B. Oxytocin
- C. Thyroxin
- D. Parathormone
Explanation: Thyroxine (T4) promotes bone growth and the ossification process, especially during development.
Correct answer: Parathormone- A. Cretinism
- B. Dwarfism
- C. Grave's disease
- D. Addison's disease
Explanation: In congenital hypothyroidism (cretinism), brain development is impaired due to thyroxine deficiency.
Correct answer: Cretinism- A. Sex hormones
- B. Pituitary hormone
- C. Thyroid hormone
- D. Parathyroid hormone
Explanation: Thyroid hormones drive metamorphosis in amphibians, regulating resorption of larval organs and growth of adult organs.
Correct answer: Thyroid hormone124. Due to hypersecretion of thyroxine, there is increased BMR and exophthalmic goiter. This occurs in:
- A. Addison's disease
- B. Grave's disease
- C. Cushing's disease
- D. Diabetes mellitus
Explanation: Graves' disease is an autoimmune disorder causing hyperthyroidism. It leads to increased basal metabolic rate, thyroid enlargement, and…
Correct answer: Grave's disease- A. Iron
- B. Zinc
- C. Iodine
- D. Sodium
Explanation: Iodine is essential for synthesis of thyroid hormones. Its deficiency leads to goiter due to overstimulation of thyroid gland by TSH.
Correct answer: Iodine- A. Insulin
- B. Calcitonin
- C. FSH
- D. TSH
Explanation: Parathyroid hormone increases blood calcium by stimulating bone resorption. Calcitonin lowers calcium levels.
Correct answer: Calcitonin- A. Diabetes
- B. Dwarfism
- C. Kidney stones
- D. Muscular tetany
Explanation: Hypoparathyroidism causes decreased PTH secretion → low blood calcium → increased excitability of nerves and muscles → painful spasms…
Correct answer: Muscular tetany- A. Endoctine
- B. Exocrine
- C. Merocrine
- D. Autocrine
Explanation: About 98% of pancreas is exocrine, consisting of acini that secrete digestive enzymes (amylase, lipase, trypsin) into the small intestine.
Correct answer: Exocrine- A. Inhibits glycogen hydrolysis
- B. Increases glycolysis
- C. Converts glucose to protein
- D. Increases lipolysis
Explanation: Insulin promotes glucose uptake, glycogen formation, glycolysis, protein synthesis, and fat storage.
Correct answer: Increases lipolysis- A. Glycogenesis
- B. Gluconeogenesis
- C. Lipolysis
- D. Protein synthesis
Explanation: Glucagon raises blood glucose by stimulating glycogen breakdown, gluconeogenesis, and lipolysis. It does not promote protein synthesis.
Correct answer: Protein synthesis- A. Aldosterone
- B. Cortisol
- C. ADH
- D. Calcitonin
Explanation: Cortisol, a glucocorticoid, mobilizes glucose during stress by gluconeogenesis.
Correct answer: Cortisol- A. ADH
- B. Cortisol
- C. Aldosterone
- D. Calcitonin
Explanation: Aldosterone enhances sodium reabsorption and potassium excretion in renal tubules.
Correct answer: Aldosterone- A. Oxytocin
- B. Prolactin
- C. Estrogen
- D. Progesterone
Explanation: Prolactin stimulates mammary glands for milk production, while oxytocin aids milk ejection.
Correct answer: Prolactin- A. Cortisol
- B. Melatonin
- C. Serotonin
- D. Thyroxine
Explanation: Melatonin, secreted by the pineal gland, controls sleep-wake cycles.
Correct answer: Melatonin- A. Glucagon
- B. Cortisol
- C. Insulin
- D. Epinephrine
Explanation: Insulin decreases blood glucose by promoting glucose uptake and glycogen formation.
Correct answer: Insulin- A. Thyroid
- B. Pituitary
- C. Adrenal
- D. Hypothalamus
Explanation: The pituitary controls many other endocrine glands and is called the "master gland".
Correct answer: Pituitary- A. Progesterone
- B. Prolactin
- C. Oxytocin
- D. Relaxin
Explanation: Oxytocin stimulates strong uterine contractions during labor and aids milk ejection.
Correct answer: Oxytocin- A. Somatotrophic Hormone
- B. Aldosterone Hormone
- C. Gonadotrophic Hormone
- D. Thyroxine Hormone
Explanation: Aldosterone is a steroid hormone. Its main role is to regulate salt and water in the body, thus having an effect on blood pressure.Growth…
Correct answer: Aldosterone Hormone- A. Phosphate
- B. Calcium
- C. Iodine
- D. Sodium
Explanation: Iodine is essential to maintain a healthy thyroid. Iodine is the critical 'ingredient' for the production of thyroid hormones.
Correct answer: Iodine- A. Aldosterone: Atrial Natriuretic Factor
- B. Relaxin: Inhibin
- C. Parathormone: Calcitonin
- D. Insulin: Glucagon
Explanation: Relaxin hormone is secreted by ovary and placenta during pregnancy, which relaxes ligaments in pelvis and softens and widens cervix during…
Correct answer: Relaxin: Inhibin