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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Exposure to bright Light discourages the secretion or ________.

  1. a. glucagon
  2. b. melatonin
  3. c. thyroid hormone
  4. d. parathyroid hormone

Summary Introduction

Introduction: Melatonin hormones are produced in the brain by the pineal gland that regulates the sleep and wake cycle in the body. Melatonin mainly helps to carry the circadian as well as the seasonal rhythms of our body. Melatonin levels increase at nighttime and decrease with daytime. Bright light exposure discourages the secretion of melatonin.

Explanation

Reason for the correct answer:

Melatonin is called as the “hormone of darkness” The hormones levels get increased during the night and their level gradually decreases when exposed to light. In many westernized and industrialized countries, the melanin secretion in human body diminishes due to the increased night-time exposure to artificial light.

Option b. is given as “melatonin”. Melatonin hormone secretion increases during nocturnal cycles and gets suppressed during the diurnal cycle.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “glucagon”. Glucagon is the hormone produced by alpha cells of the pancreas for controlling the blood sugar levels. It helps to prevent the falling of blood glucose level in our body. This is incorrect because glucagon production by our body is independent of the light exposure...

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