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प्रश्न
How does chemical coordination take place in animals?
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उत्तर
In animals, chemical coordination is coordinated by hormones. The organ system responsible for the synthesis and regulation of these hormones is known as the endocrine system. Hormones are secreted in very less amount by the endocrine glands. These glands being ductless, the secretions directly mix into the bloodstream. From there it moves to specific target organs where it shows its effects. For example, growth hormone is synthesized by the pituitary gland which mainly acts on the bones of a developing child and increases the height of the child.
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संबंधित प्रश्न
How does our body respond when adrenaline is secreted into the blood?
Name the hormones secreted by the given endocrine glands and specify one function.
Thyroid
Where are hormones made in the human body?
What part does the diet play in helping us to have a healthy thyroid gland?
Which one term of the following includes the other three?
thyroid, ductless gland, thymus, pituitary, ovary
Which one term of the following includes the other three?
adrenalin, insulin, hormone, thyroxine, estrogen
Fill in the following blanks with suitable words :
The two examples of effectors are .........and ...........
Name the hormones secreted by given endocrine glands :
Thyroid gland
Name the hormones secreted by given endocrine glands:
Adrenal glands
Why is the use of iodised salt advisable?
One of the following acts as an endocrine gland as well as an exocrine gland. This one is :
(a) salivary gland
(b) pancreas
(c) pituitary
(d) parathyroid
The hormone which is associated with male puberty is called :
(a) oestrogen
(b) adrenaline
(c) testosterone
(d) progesterone
A doctor advised a person to take injection of insulin because :
(a) his blood pressure was high
(b) his heart beat was high
(c) his blood sugar was high
(d) his thyroxine level in blood was high
One of the following statements is not true about thyroxine. This is :
(a) Thyroid gland requires iron to synthesise thyroxine
(b) It regulates carbohydrate, protein and fat metabolism
(c) Iodine is essential for the synthesis of thyroxine
(d) Thyroid gland can enlarge due to lack of thyroxine
The faulty functioning of an endocrine gland can make a person very short or very tall. This gland is :
(a) thyroid
(b) pineal
(c) adrenal
(d) pituitary
The gland X which is located just below the brain in the human head secretes a chemical substance Y which controls the development of ones and muscles in the body of a person. Secretion of too little of substance Y as well as the secretion of too much of substance Y by the gland X leads to abnormal development of the body of a person.
(a) Name the gland X.
(b) What is the chemical substance Y?
(c) What happens if too little of substance Y is secreted?
(d) What happens if too much of substance Y is secreted?
(e) Name the system of glands in the human body of which gland X is a part.
The secretion of which hormone leads to physical changes in the body when you are 10-12 years of age?
Name the gland and the hormone secreted by it in scary situations in human beings. List any two responses shown by our body when this hormone is secreted into the blood.
We are advised to take iodised salt in our diet by doctors. Justify its importance in our bodies.
