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Multiple choice biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

Which of these properties are not present in hormones?

  1. They can easily diffuse through membranes.

  2. They are specific in their action.

  3. They are never stored in body and synthesized at once.

  4. They have a high molecular weight and not found in plants.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • A hormone may be defined as a specific product (organic substance) of an endocrine gland secreted into the blood which carries it to a specific part of the body where it produces a definite physiological effect. 
  • Hormones exert their effects not where they are locally produced, but on other tissues of the body. And never stored in the body and synthesized at once.  Hence,  They have a high molecular weight and not found in plants is not the property of hormones.
 So, the correct answer is 'They have a high molecular weight and not found in plants'.

Multiple choice biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

Hormones affect distant cells by controlling .......... proteins.

  1. Acceptor

  2. Receptor

  3. Basic

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • A hormone receptor is a receptor molecule that binds to a specific hormone.
  • Hormone receptors are a wide family of proteins made up of receptors for thyroid and steroid hormones, retinoids and Vitamin D, and a variety of other receptors for various ligands, such as fatty acids and prostaglandins. Hence, Hormones affect distant cells by controlling Receptor proteins.  
 So, the correct answer is 'Receptor'.

Multiple choice biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

Which of the following hormones is known to have calorigenic effect?

  1. $T _1$ & $T _1$

  2. TCT

  3. PTH

  4. Calcitriol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The calorigenic effect is a result of the increased metabolic rate and increased oxygen consumption by cells. When the metabolic rate increases, more heat is generated.T1 and T1 are hormones that have a calorigenic effect.

So, the correct option is 'T1 and T1'.

Multiple choice biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

The secretion of following anterior pituitary hormones is controlled by hypothalamus

  1. Thyrotropin (TSH) and cortisol

  2. Follicle stimulating hormone (FSH) and progesterone

  3. Corticotropin (ACTH), growth hormone and

    vasopressin

  4. Luteinizing hormone (LH), corticotropin (ACTH) and

    thyrotropin (TSH)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hypothalamus secretes both releasing and inhibitory hormones controlling the secretion of some anterior pituitary hormones(LH, ACTH, and TSH etc.)

Multiple choice biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

Hormones are called chemical signals that stimulate specific target tissues. Which is the correct location of these receptors in case of protein hormones?

  1. Extracellular matrix

  2. Blood

  3. Plasma membrane

  4. Nucleus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hormones of protein nature binds to specific receptor molecules located on the plasma membrane to form the hormone receptor complex.

Multiple choice biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

Which of these functions hormones perform in our body?

  1. Regulation of cellular activities and influencing growth

  2. Regulation of intermediary metabolism

  3. Maintenance of homoeostasis

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • The functions of Hormones are : 
1. Hormones are produced by a specialized gland and are secreted directly into the bloodstream.
 2. Hormones are transported by the bloodstream from the endocrine cells to serve as ‘chemi­cal messenger’ which act on target cells or organs by regulating the rates of specific metabolic reactions. 
3. Hormones exert their effects not where they are locally produced, but on other tissues of the body. 
4. Hormones are required in very small amounts and their effect may be excitatory or inhibitory depending upon their concentration and the physiological state of the responding tissue. Hence, Regulation of cellular activities and influencing growth, Regulation of intermediary metabolism and Maintenance of homoeostasis are the functions hormones perform in our body. 
So, the correct answer is 'All of the above'.