Which gland is both exocrine and endocrine?

Name the peptide hormone that acts mainly on hepatocytes and adipocytes and enhances cellular glucose uptake and utilization.

Which one of the following hormones is produced by the $\beta$-cells of the Islets of Langerhans in the pancreas?

Glucagon,secreted by the $\alpha$-cells of the Islets of Langerhans,performs which of the following functions?

Which of the following statements is incorrect regarding insulin and glucagon?

Select the correct option for the following statements:
$(i)$ The pancreas is a $heterocrine$ / $endocrine$ gland.
$(ii)$ $Muscular$ $tissue$ / $Neural$ $tissue$ is a composite tissue.