Question

Ste the characteristics of hormones.... don't copy and paste the answer. ... .........from internet​

Answer 1

Hormones :

• Hormones are released by the stimulated cells and diffuse all around the original cell.
• Synthesis occurs at places away from the site of action to where they simply diffuse .
• Target cells detect this compound by the special molecules present on their surface .
• Their processing and transmittance is lower than electrical impulse .
• They reach all the cells of the body regardless of nervous connections and it is done steadily and persistently.

Plant Hormones :

Auxin -

• They are usually synthesized in the tip of shoots.
• It helps them to grow longer when plants are placed facing a light source they ,show bending towards it .
• This is because the oxygen diffuses towards the shady side of the shoot simulating the cells to grow longer .

Gibberellins -

• The hormones that help in the growth of the stem and flower .

Cytokinins -

• They are the hormones which promote cell division.
• Highest concentration of cytokinin occur in fruits and seeds.

Abscisic acid -

• The our growth inhibitor
• It is responsible for wilting of leaves .

Animal Hormones :

Adrenaline -

• It is secreted by adrenal glands
• It works in stressful situations .
• Its target organ is heart which as a result beats faster to supply more oxygen to the muscles .
• The blood to the digestive system and skin is reduced due to contraction of muscles around small arteries in their organs .
• This diverts the blood to the skeletal muscles the breathing rate also increases because of the contractions of the diaphragm and the rib muscles .
• All these responses together and able the body to deal with the situation .

Thyroxine -

• It is secreted by thyroid gland.
• It regulates Carbohydrates, protein and fat metabolism in the body.
• Iodine is essential for its synthesis its deficiency leads to Goitre.

Growth hormones -

• It is secreted secreted by pituitary gland , regulates growth and development in body.
• Its deficiency may cause dwarfism and gigantism

Testosterone and Oestrogen -

• The changes associated with puberty are because of the secretion of testosterone in males and oestrogen in females .

Insulin -

• It is produced by pancreas and helps in regulating blood sugar level.
• Its deficiency may cause diabetes .

Answer 2

$\sf\huge{\underline{\underline{\red{Hormone}}}}-$

Hormones are defined as the messenger chemicals secreted by endocrine glands into the blood stream, to reach the target molecules in order to regulate the biological processes in the living organisms.

$\sf\large{The\:characteristics\:of\:hormones\:are:}$

• They are specific chemical messengers.
• They are secreted by endocrine glands.
• They are poured directly into the blood and carried by blood circulation.
• They act on specific tissue/organ called target organ.

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