Mention 4 functions of thyroxine hormone ??
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Answer:
Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones.
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• Functions of Thyroid hormone •
- The thyroid homones increase the metabolic activities of almost all the tissues of the body.
• The Basal Metabolic Rate (BMR) is increased.
- Basal metabolic rate (BMR) is the rate of energy expended while at rest.
The rate of utilization of foods for energy is greatly accelerated.
Although the rate of protein synthesis is increased, at the same time the rate protein catabolism is also increased.
The growth rate of young people is greatly accelerated.
The mental processes are excited, and the activities of most of the other endocrine glands are increased.
mitochondria in most cells of the increase in size as well as number
- the total membrane surface area of the mitochondria increases
more ATP •
1 Na* K* ATPase activity
↑ transport of both sodium and potassium ions through the cell membranes
more energy
more heat
Growth - ⤵️
the effect of thyroid homone on growth is manifest mainly in growing children.
In those who are hypothyroid, the rate of growth is greatly retarded.
In those who are hyperthyroid, excessive skeletal growth often occurs, causing the child to become considerably taller at an earlier age
amphibian metamorphosis •
To promote growth and development of the brain during fetal life and for the first few years of postnatal life