Question:

Fight and flight hormone is

Updated On: Jul 28, 2022
  • adrenaline
  • thyroxine
  • ADH
  • oxytocin
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The Correct Option is A

Solution and Explanation

Adrenaline, released by adrenal medulla, are a part of the fight or flight reaction that prepares the body to meet the stress, pain, anger, fear etc. It increases blood pressure, basal metabolic rate, lipolysis in adipose tissue to increase level of fatty acids in blood, acts as vasodilator, increase respiration rate as it dilates trachea, increases sugar level in blood etc. Adrenaline is also called emergency hormone. Thyroxine control BMR (basal metabolic rate) of the body. ADH is antidiuretic hormone. It is also called vasopressin. It acts on the kidney and concentrating the urine by promoting the reabsorption of water and salt into the cortical collecting duct. Oxytocin is birth hormone and milk ejecting hormone.
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Concepts Used:

Chemical Coordination and Integration

The chemical coordination and integration of all physiological functions in the animal body are jointly synchronized by the neural and endocrine systems. The control and coordination of body functions are executed by the endocrine glands. They are ductless glands that secrete severel hormones to control and coordinate body functions.

Human Endocrine System:

The human body has several endocrine glands located in different parts. They cover the pituitary gland, thymus, thyroid gland, pineal gland, parathyroid, pancreas (dual gland), adrenal gland, and gonads (testes and ovaries). The liver, kidney, heart, and gastrointestinal tract also produce hormones in small traces to harmonize the functioning of these organs.

The Hypothalamus comprises groups of secretory cells called nuclei which secrets various hormones. These hormones released by the hypothalamus are important in regulating the synthesis and secretion of pituitary hormones.

Functions of Endocrine Glands:

  • Pituitary Gland
  • Pineal Gland
  • Thyroid Gland
  • Parathyroid Gland
  • Thymus
  • Adrenal Gland
  • Pancreas
  • Testes
  • Ovary
  • Hormones of Kidney, Heart, and Gastrointestinal Tract