How Does Chemical Coordination Take Place in Animals, Why is the in Text Question Chapter 7 Control and Co-ordination

In text questions of page no. 125

Q. No. 1: How does chemical coordination take place in animals?
Ans: Chemical coordination takes place in animals with the help of hormones. Hormones are the chemical fluids that are secreted by the glands of the endocrine system. Hormones regulate the overall growth and development of the animals.

Q. No. 2: Why is the use of iodised salt advisable?
Ans: Iodine is needed by the thyroid gland for the production thyroxin hormone. This hormone regulates fat, protein and carbohydrate metabolism in our body. If this is in deficient quantity then the neck will swell up due to the enlargement of thyroid gland. This deficiency disease is known as goitre.
Therefore the iodised salt is advised.

Q. No. 3: How does our body respond when adrenaline is secreted into the blood?
Ans: When someone is in danger or in emergency then adrenal gland secrete adrenaline hormone. It is secreted directly into the blood and is transported to different parts of the body. It speeds up the heartbeat and hence supplies more oxygen to the muscles. This results in increasing breathing rate and blood pressure which enable them to fight with such urgent situation.

Q. No. 4: Why are some patients of diabetes treated by giving injections of insulin?
Ans: Insulin is a hormone secreted by pancreas that regulates the sugar level in the blood. When this hormone is not synthesised in proper amount then the sugar level in the blood rises and the persons suffer from diabetes.
This is the reason why diabetic patients are treated by giving injections of insulin.