justify that pancreas and gonads perform dual function .

Pancreas are known to have a dual function because it acts as both an endocrine gland and exocrine gland i.e. it is a part of both the hormonal and digestive system of the body respectively. So, it is also called heterocrine gland.

It secretes hormones insulin and glucagon as well as digestive enzymes. 

Gonads perform dual functions one is the production of gametes, in addition to this they also show endocrine function by producing sex hormones. for example ovary is the primary reproductive organ and performs dual function.

1. Production of female gamete: Ovum

2. Secretion of female sex hormones: estrogen and progesterone.

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Some of the endocrine glands are highly specialized for endocrine function and do little else of note: others, such as thepancreasandgonads, perform an endocrine function in addition to other functions performed within the primary system of which they are a part. Because of this dual function of some organs, you will have previously seen much of the material to be considered in this section

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