Diabetes mellitus is caused due to the deficiency of:

Beta and alpha cells secrete the following hormones in respective order:

Glucagon is secreted by which of the following?

$A$ sample of urine was diagnosed to contain a high content of glucose and ketone bodies. Based on this observation, answer the following:
$(a)$ Which endocrine gland and hormone is related to this condition?
$(b)$ Name the cells on which this hormone acts.
$(c)$ What is the condition called and how can it be rectified?

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

What is the normal percentage of sugar in human blood (in $\%$)?