Testing ANS #shorts (Part C)

The video tutorial explains the effects of parasympathetic innervation, focusing on bronchoconstriction and heart rate reduction. It highlights acetylcholine's role in these processes, particularly its unique function in sympathetic neurons affecting sweat glands.

What effect does parasympathetic innervation have on the airways?

• Decreased mucus production

• Increased mucus production

• Bronchoconstriction

• Bronchodilation

Which neurotransmitter is responsible for decreasing heart rate through the SA node?

• Dopamine

• Acetylcholine

• Serotonin

• Norepinephrine

What is the role of the SA node in the heart?

• It acts as a valve

• It filters blood

• It pumps blood

• It is the pacemaker

In which scenario do postganglionic sympathetic neurons release acetylcholine?

• On cardiac muscle

• On sweat glands

• On skeletal muscle

• On digestive organs

What is the usual neurotransmitter released by postganglionic sympathetic neurons?

• Norepinephrine

• Dopamine

• Serotonin

• Acetylcholine