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2022-02-24 17:59:16 JEE / NEET OSWAAL EDUCART SAMPLE PAPER pinned «JEE (Advanced) 2022 will be conducted on Sunday, July 3, 2022. The complete schedule is available here.» Open / Comment

2022-02-24 15:40:14 JEE (Advanced) 2022 will be conducted on Sunday, July 3, 2022. The complete schedule is available here. Open / Comment

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2022-02-21 20:42:06 ALCOHOLS NOTES

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2022-02-20 09:50:24 Properties of Scalar Product:-

(i) Scalar product is commutative, i.e., A * B= B*A

(ii) Scalar product is distributive, i.e., A * (B + C) = A * B + A * C

(iii) Scalar product of two perpendicular vectors is zero. A * B = AB cos 90°=O

(iv) Scalar product of two parallel vectors is equal to the product of their magnitudes, i.e., A * B = AB cos 0° = AB


(v) Scalar product of a vector with itself is equal to the square of its magnitude, i.e.,
A * A = AA cos 0° = A2 Open / Comment

2022-02-18 11:02:22 JEE AND NEET BOOKS | PDFS | NOTES | pinned « Notes on Chemical Coordination and Regulation Properties of hormones (a) These are secreted by endocrine gland (biogenic in origin). (b) Their secretions is released directly into blood (except local hormones e.g. gastrin). (c) These are carried to distantly…» Open / Comment

2022-02-18 08:52:06 Notes on Chemical Coordination and Regulation


Properties of hormones
(a) These are secreted by endocrine gland (biogenic in origin).

(b) Their secretions is released directly into blood (except local hormones e.g. gastrin).

(c) These are carried to distantly locate specific organs, called target organ.

(d) These have specific physiological action (excitatory or inhibatory). These co-ordinate different physical, mental and metabolic activities and maintain homeostasis.

(e) The hormones have low molecular weight e.g. ADH has a molecular weight of 600–2000 daltons.

(f) These act in very low concentration e.g. around10–10 molar.

(g) Hormones are non antigenic.

(h) These are mostly short-lived. So have a no camulative effect.

(i) Some hormones are quick acting e.g. adrenalin, while some acting slowly e.g. ostrogen of ovary.

(j) Some hormones secreted in inactive form called Prohormone e.g. Pro-insulin.

(k) Hormones are specific. They are carriers of specific information to their specific target organ. Only those target cell respond to a particular hormone for which they have receptors. Open / Comment