Advertisements
Advertisements
Questions
Describe the T. S. of thyroid gland
Sketch and label T.S. of the thyroid gland.
Advertisements
Solution
Thyroid gland is externally covered by connective tissue sheath or capsule.
From the capsule, number of septa called trabeculae arise, which divide the thyroid gland into
several lobules. The lobules contain about 3 million thyroid follicles. Each thyroid follicle is oval in shape and varies in size. Larger follicles are present towards periphery, whereas smaller ones are present in the interior. The follicles are surrounded by a connective tissue called interfollicular tissue which contains blood vessels and nerve fibres.Each follicle is lined by a single layer of cuboidal glandular epithelium which rest on a very thin
basement. The follicular cavity or acinus is filled by dense amorphous semisolid substance called colloid, which is thyroglobulin, a precursor of thyroid hormone, thyroxine. Other cells bigger than follicular cells are also present singly or in groups in the connective tissue.
These are called parafollicular or ‘C’ cells.
They secrete hormone thyrocalcitonin.
APPEARS IN
RELATED QUESTIONS
Define the following:
Hormone
Choose the odd one out from each series
The glands – thyroid, adrenal, pituitary, prostate
…………………………………………
Mention which of the statements are true (T) and which are false (F). Give reason in support of your answer.
There are two kinds of diabetes (mild and severe) related with two different hormones.
State whether the following statement is true or false. If false, rewrite changing the word.
The pituitary gland is both exocrine and endocrine in function.
The release of progesterone in the urine is an indication of pregnancy. Explain.
Differentiate: Gigantism and Acromegaly.
Vasopressin is concerned with:
A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient and abnormal skin. This is the result of ______.
In humans, the life processes are controlled and regulated by ____________.
Distinguish between the following pair:
Enzymes and hormones (mode of transport and target organ)
