hyperthyroidism increases heart rate, but this can be offset by
beta agonists. This implies that thyroxine:

A. increases the release of norepinephrine from the adrenal
gland

B. decreases the activity of the parasympathetic nervous
system

C. decreases the activity of the sympathetic nervous system

D. increases epinephrine release from the synaptic terminal in
the heart

E. increases the number of beta receptors on heart cells