Epinephrine also called adrenaline is the main hormone along

Epinephrine (also called adrenaline) is the main hormone (along with norepinephrine) secreted by the _____. Norepinephrine is also released as a neurotransmitter by sympathetic postganglionic neurons. Both epinephrine and norepinephrine act on ____ receptors on the heart. When you apply exogenous epinephrine, it should ____ heart rate because of its interactions with the pacemaker cells. What do you predict will happen to force of contraction? _____ Why?

Solution

epinephrine is the main hormone secreted by adrenal gland. norepinephrine is also released as a neurotransmitter by sympathetic postganglionin neurons. both epinephrine and norepinephrine act on beta-1 receptors on the heart. when you apply exogenous epinephrine, it should increase heart rate because of its interactions with the pacemaker cells. since the cardiac output is increased, force of contraction also increases.