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 8 of 13
- A. The sympathetic nervous system is activated releasing epinephrine and norepinephrine from the adrenal medulla
- B. Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse.
- C. Hypothalamus activates the parasympathetic division of brain
- D. Sympathetic nervous system is activated releasing epinephrine and norepinephrine from the adrenal cortex.
Explanation: Hormones epinephrine and norepinephrine are secreted from the adrenal medulla.
Correct answer: The sympathetic nervous system is activated releasing epinephrine and norepinephrine from the adrenal medulla- A. Biogenic amines only
- B. Proteins, steroids and biogenic amines
- C. Proteins only
- D. Steroids only
Explanation: Hormones are chemical messengers produced by the ductless glands (sometimes by neurons) and transported in the circulation to target…
Correct answer: Proteins, steroids and biogenic amines- A. Cortisone
- B. Cortisol
- C. Corticosterone
- D. Deoxycorticosterone
Explanation: Adrenal glands or (suprarenal glands) are two triangular endocrine glands, each of which covers the superior surface of a kidney.
Correct answer: Cortisol- A. Adrenaline
- B. Glucagon
- C. Gastrin
- D. Thyroxine
Explanation: The correct answer is Adrenaline. This hormone is crucial during stressful situations, such as feeling the tremors of an earthquake, as it…
Correct answer: Adrenaline- A. Increases blood glucose level by stimulating glucagon production
- B. Decreases blood glucose levels by forming glycogen
- C. Increases blood glucose levels by promoting cellular uptake of glucose
- D. Increases blood glucose levels by hydrolysis of glycogen
Explanation: Insulin is a peptide hormone, secreted by the b cells of the islets of Langerhans in the pancreas, that promotes the uptake of glucose by…
Correct answer: Decreases blood glucose levels by forming glycogen- A. Cancer of the thyroid gland
- B. Oversecretion of pars distalis
- C. Deficiency of iodine in diet
- D. Low secretion of growth hormone
Explanation: Iodine is needed for the synthesis of T3 and T4. Iodine binds to the tyrosine residues in thyroglobulin, which is then hydrolysed into…
Correct answer: Deficiency of iodine in diet- A. Oxytocin - posterior pituitary - growth and maintenance of mammary glands
- B. Melatonin - pineal gland - regulates the normal rhythm of sleepwake cycle.
- C. Progesterone - corpus luteum-stimulation of growth and activities of female secondary sex organs
- D. Atrial natriuretic factor - ventricular wall - increases the blood pressure.
Explanation: Option C is correct. Melatonin is a hormone produced by the brain's pineal gland that primarily regulates circadian rhythms, the body's…
Correct answer: Melatonin - pineal gland - regulates the normal rhythm of sleepwake cycle.- A. Epinephrine
- B. Cortisol
- C. Melatonin
- D. Calcitonin
Explanation: The hormones epinephrine and norepinephrine are secreted from the adrenal medulla.
Correct answer: Epinephrine- A. Hyposecretion of thyroid gland
- B. Hypersecretion of thyroid gland
- C. Hyposecretion of adrenal gland
- D. Hypersecretion of adrenal gland
Explanation: Graves' disease is characterized by secretion of excessive amount of thyroid hormone (T4 and T3). It is an autoimmune disease.
Correct answer: Hypersecretion of thyroid gland- A. Corpus cardiacum
- B. Corpus luteum
- C. Corpus allatum
- D. Pineal gland
Explanation: The corpus luteum is a temporary endocrine gland in human females. It is formed after the follicle ruptures and LH transforms this…
Correct answer: Corpus luteum- A. Thyroxin
- B. Cortisol
- C. Calcitonin
- D. None of these
Explanation: Antagonistic hormones have opposite effects on one another.The hormones antagonistic to insulin are glucagon and cortisol, adrenaline, and…
Correct answer: Cortisol- A. Centrosome
- B. Nucleus
- C. Mitochondria
- D. Golgi apparatus
Explanation: Option A: Neurons cannot undergo division because they do not have centrosomes.
Correct answer: Centrosome- A. Gibberellins
- B. Ethylene
- C. Cytokinins
- D. Auxins
- E. Abscisic acids
Explanation: Auxins are plant hormones that play a crucial role in regulating plant growth and development.
Correct answer: Auxins- A. Oxytocin
- B. Parathormone
- C. Glucagon
- D. Insulin
- E. Cortisol
Explanation: Diabetes mellitus is a metabolic disorder characterized by high levels of glucose in the blood due to the inability of the body to produce…
Correct answer: Insulin- A. Ethene
- B. Gibberellins
- C. Cytokinins
- D. Abscisic acid
Explanation: Stomatal closure is a common adaptation response of plants to the onset of drought condition
Correct answer: Abscisic acid- A. Somatotropin hormone
- B. Thyroid stimulating hormone
- C. Antidiuretic hormone
- D. Gonadotrophic hormone
Explanation: ADH is produced by the hypothalamus in the brain and stored in the posterior pituitary gland at the base of the brain.
Correct answer: Antidiuretic hormone- A. ADH
- B. Thyroxin
- C. Cortisone
- D. Insulin
Explanation: Steroid hormones are fat-soluble molecules made from cholesterol. Among these are the three major sex hormone groups: estrogens…
Correct answer: Cortisone- A. Nervous stimulation
- B. Chemical stimulation
- C. Both chemical and nervous stimulation
- D. None of the given options
Explanation: The diameter of any given vessel may also change frequently throughout the day in response to neural and chemical signals that trigger…
Correct answer: Both chemical and nervous stimulation- A. Adrenaline
- B. Non adrenaline
- C. Thyroxin
- D. Insulin
Explanation: Adrenaline triggers the body's fight-or-flight response. This reaction causes air passages to dilate to provide the muscles with the…
Correct answer: Adrenaline- A. Auxins
- B. Gibberellins
- C. Abscisic acid
- D. Cytokinins
- E. All of the above
Explanation: Phytohormones are critical for plant growth, development, and responses to stimuli.
Correct answer: All of the above