Vomiting Center and Nervous System Pathways Quiz

Which part of the nervous system helps mediate the vomiting center with communication via afferent and efferent nerves to and from the gastrointestinal (GI) tract?

• Autonomic nervous system

• Somatic nervous system

• Endocrine system

• Lymphatic system

What is the primary function of the dorsal vagal complex in the context of vomiting?

• Coordinates the emetic reflex

• Regulates blood pressure

• Controls voluntary muscle movement

• Produces digestive enzymes

Which system helps mediate the vomiting center according to the diagram?

• Vestibular system

• Endocrine system

• Renal system

• Muscular system

Which of the following is NOT involved in the communication with the vomiting center as shown in the diagram?

• Central nervous system

• Vestibular system

• Gastrointestinal tract and heart

• Skeletal muscle system

Which receptor's activation leads to the release of emetic neurotransmitters such as dopamine, cholecystokinin, glutamate, acetylcholine, substance P, and 5-HT?

• H1 receptor

• 5HT3 receptor

• D2/3 receptor

• NK1 receptor

What is the effect of M1 receptor stimulation by acetylcholine?

• Inhibits emesis

• Evokes emesis

• Causes sedation

• Stimulates appetite

Which receptor is located in the brainstem and is stimulated by vestibular hyperactivity to trigger emesis?

• D2/3 receptor

• 5HT3 receptor

• H1 receptor

• NK1 receptor

D2/3 receptor stimulation throughout the dorsal vagal, vagal nerves, and GI tract leads to which response?

• Inhibition of emesis

• Evokes emesis

• Increased heart rate

• Muscle relaxation

Stimulation of which receptor by substance P excites neurons in the area postrema and evokes emesis?

• H1 receptor

• M1 receptor

• NK1 receptor

• D2/3 receptor

Explain how the activation of the 5HT3 receptor can lead to emesis, including the role of neurotransmitters and peptides involved.

• It inhibits neurotransmitter release, reducing emesis.

• It activates an ion channel, leading to the release of emetic neurotransmitters and/or peptides such as dopamine, cholecystokinin, glutamate, acetylcholine, substance P, and 5-HT, which collectively evoke emesis.

• It blocks the action of acetylcholine, preventing emesis.

• It stimulates the GI tract to absorb more nutrients, reducing emesis.