How does chemical coordination take place in animals?
Chemical coordination takes place in animals by the chemical messengers called hormones, which are secreted by the endocrine glands or occurs by the nervous system. When endocrine glands secrete hormones, neurosecretory cells are present in the brain which secrets the neurotransmitters which are released into the blood stream to reach the target site. And, these chemical messengers get converted into electrical signals and goes into muscles or glands for the movement or for the growth and development of an animal.
Like in adrenal medulla, it secretes two hormones epinephrine and Norepinephrine which prepare the animal to face special condition created by physical stress such as fall in blood pressure or blood sugar etc. all these conditions require more energy provided by increasing heart beat, blood pressure, respiratory rate etc. Heart speeds up the pumping action so that more blood could be supplied to the body parts and shows various activities. These both hormones role also called fight or flight reaction which prepares us to meet the stress.
Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.
| Material medium |
Refractive index |
Material medium |
Refractive index |
| Air | 1.0003 | Canada Balsam |
1.53 |
| Ice | 1.31 | ||
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | ||
| Kerosene | 1.44 | Carbon disulphide |
1.63 |
| Fused quartz |
1.46 | ||
| Turpentine oil |
1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass |
1.52 | Diamond | 2.42 |
Table 10.3 Absolute refractive index of some material media
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
Welcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 52: How does chemical coordination take place in animals?....
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