Mention three characteristic features of hormonal secretions in human beings.
Mention three characteristic features of hormonal secretions in human beings.
Based on the principles of chemical communication described in the text, three characteristic features of hormonal secretions (chemical messengers) in human beings are:
- Widespread Reach (Not limited by nervous connections): Unlike electrical impulses which only reach cells connected by nervous tissue, hormonal secretions diffuse all around and can reach each and every cell of the body.
- Specific Target Action via Receptors: Hormones are recognized only by those target cells that have special molecules (receptors) on their surfaces to detect them.
- Sustained and Continuous Transmission: Unlike nervous transmission where cells must take time to reset their mechanisms before transmitting a new impulse, chemical communication allows cells to continually transmit and maintain information over a longer duration.
Marking Scheme
- 11 mark
- 21 mark
- 31 mark
Hint
Compare how chemical signals travel and act on cells versus how electrical impulses are limited by nerve connections and cellular recovery time.
Quick Oral Answer
Hormones are chemical messengers that diffuse to reach cells not connected by nervous tissue, bind to specific surface receptors, and provide a sustained response without requiring cells to constantly reset electrical mechanisms.
Analysis & Explanation
The text contrasts electrical impulses with chemical communication (hormones). Electrical impulses are fast but have two major limitations: they only reach cells connected by nervous tissue, and cells cannot continually create and transmit them because they need time to reset their mechanisms. Chemical communication overcomes these limitations because the chemical compound diffuses widely, reaching all cells, and is detected specifically by cells with matching surface receptors, allowing for a steady, coordinated response.
Common Mistakes
- 1Writing general properties of hormones (like 'secreted by ductless glands') without linking them to the fundamental principles of chemical communication described in the text.
- 2Confusing the speed of hormonal action with nervous action without explaining the underlying cellular reasons.
Interesting Facts
Because chemical messengers diffuse through body fluids, they can coordinate activities in widely separated parts of the body simultaneously, which is essential for processes like growth and development.
Spotted a mistake or something unclear?
Tell us — we fix reported answers fast.
Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2014?
This question carries 3 marks in the CBSE Class 10 Science 2014 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Control and Coordination" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Chemical Coordination" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2014 paper?
This is a Short Answer question from Section SECTION-A in the CBSE Class 10 Science 2014 paper.