Sympathetic Nervous System Functions

Dr. Mike explains the sympathetic nervous system, a part of the autonomic nervous system activated during fight or flight situations. He discusses the roles of neurotransmitters like noradrenaline and hormones like adrenaline, and their interaction with adrenergic receptors. The video covers the types and functions of these receptors, including alpha and beta receptors, and their locations in the body. Dr. Mike provides a cheat sheet for understanding receptor functions and how they contribute to sympathetic responses, emphasizing the importance of stimulation and inhibition in maintaining homeostasis.

What is the primary role of the sympathetic nervous system during a fight or flight response?

• To decrease heart rate

• To increase digestive activity

• To maintain homeostasis in stressful situations

• To promote relaxation and sleep

Which neurotransmitter is released by the sympathetic nervous system?

• Noradrenaline

• Dopamine

• Serotonin

• Acetylcholine

What is the American term for noradrenaline?

• Dopamine

• Epinephrine

• Adrenaline

• Cortisol

Which adrenergic receptor is primarily found in the heart?

• Beta-2

• Alpha-2

• Beta-1

• Alpha-1

Where are beta-2 receptors commonly found?

• In the airways

• In the liver

• In the heart

• In the kidneys

What is the function of alpha-1 receptors in the sympathetic nervous system?

• To increase heart rate

• To constrict blood vessels

• To relax airways

• To dilate blood vessels

What is the role of the juxtaglomerular cells in the kidneys?

• To filter blood

• To release renin

• To store glucose

• To produce adrenaline

How do beta-2 receptors affect the airways during a sympathetic response?

• They constrict the airways

• They relax and open the airways

• They decrease oxygen intake

• They increase mucus production

Which receptor type is responsible for inhibiting the sympathetic response?

• Beta-2

• Alpha-2

• Beta-1

• Alpha-1

What is the purpose of negative feedback in the sympathetic nervous system?

• To increase heart rate

• To prevent excessive sympathetic activity

• To enhance the fight or flight response

• To stimulate digestion