Q23 of 54 Page 51

Which gland is called the ‘dual gland’? Why?

Pancreas is called the Dual gland. It is called so because it exhibits both exocrine and endocrine nature.

Exocrine nature of pancreas-


Pancreas exhibit exocrine nature because it secretes some enzymes through its acinar cells which also have ducts.


It secretes chymotrypsin, pancreatic lipases through pancreatic duct and thus exhibits exocrine nature.


Endocrine nature of pancreas-


Pancreas exhibit endocrine nature due to its Islets of Langerhens. This islet of langerhens secrets hormones insulin and glucagon and are ductless. Glucagon is secreted by alpha cells and insulin is secreted by beta cells of islets of langerhens. So, in this way pancreas exhibits endocrine nature.


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Observe the following diagrams that depict the transmission of nerve impulses through two pathways from body parts to CNS:


If all the nerves at both the places are similar in thickness and structure, through which pathway will the transmission of an impulse (of the same threshold) be faster and why?

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A 16-year-old boy was brought to a doctor with a complaint of non-masculine features (lack of mustache / beard / gruff voice/broadening of shoulders etc). After keen examination, the doctor found that it was a hormonal disorder and the endocrine glands responsible were not functioning properly. Mention the glands and the hormone lacking in the boy.

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Describe the structure of a neuron with the help of a neat, labelled diagram.