Thyroid follicular cells secrete which hormones?

Which gland regulates the $BMR$ and body temperature?

On an educational trip to Uttaranchal,Ketki and her friends observe that many local people have swollen necks. Please help Ketki and her friends to find out the solutions to the following questions.
$(a)$ Which probable disease are these people suffering from?
$(b)$ How is it caused?
$(c)$ What effect does this condition have on pregnancy?

$A$ pregnant woman delivers a child who suffers from stunted growth,mental retardation,low intelligence quotient $(IQ)$,and abnormal skin. This condition is likely due to:

Give information regarding the location of the thyroid gland and its hormones.

$A$ health disorder that results from the deficiency of thyroxine in adults and is characterised by $(i)$ a low metabolic rate,$(ii)$ an increase in body weight,and $(iii)$ a tendency to retain water in tissues is: