The video tutorial discusses the sympathetic influence on heart rate, highlighting the role of the SA node as a pacemaker. It also covers the sympathetic effect on sweating, explaining how it causes increased perspiration. Finally, the tutorial identifies acetylcholine as the neurotransmitter for all postganglionic and parasympathetic functions.

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

• It decreases the heart rate.

• It controls the contraction of the ventricles.

• It acts as the pacemaker of the heart.

• It regulates blood pressure.

How does the sympathetic nervous system affect sweating?

• It only affects sweating during exercise.

• It increases sweating.

• It has no effect on sweating.

• It decreases sweating.

Which of the following is NOT a function of the sympathetic nervous system?

• Decreasing heart rate

• Increasing sweating

• Increasing heart rate

• Decreasing digestion

Which neurotransmitter is involved in all postganglionic and parasympathetic functions?

• Acetylcholine

• Serotonin

• Norepinephrine

• Dopamine

What is the primary function of acetylcholine in the nervous system?

• It increases heart rate.

• It acts as a neurotransmitter for all postganglionic and parasympathetic functions.

• It inhibits muscle contraction.

• It decreases blood pressure.