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Where are sensory signals from the stomach and small intestine sent to trigger a vomiting reflex?

A.

Cerebrum

B.

Esophagus

C.

Pharynx

D.

Medulla oblongata

Answer and Explanation

The Correct Answer is D

A. Cerebrum:  the cerebrum is involved in conscious processing; vomiting reflex is coordinated by brainstem centers.
B. Esophagus:  the esophagus is a peripheral organ and a route for vomitus, not the control center for the reflex.
C. Pharynx:  the pharynx is an anatomical structure involved in expulsion but not the central integrative center for vomiting.
D. Medulla oblongata:  the medulla oblongata (brainstem vomiting center and chemoreceptor trigger zone nearby) integrates visceral sensory input and coordinates the vomiting reflex.


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Correct Answer is {"dropdown-group-1":"C"}

Explanation

Correct answer: Interventricular septum (IV septum)

The labeled structure is the interventricular septum, the muscular wall separating the left and right ventricles.

Correct Answer is D

Explanation

A. Maintaining blood glucose concentration: Incorrect (this is a liver function) -the liver stores glycogen and performs gluconeogenesis to regulate blood glucose.
B. Secretion of bile: Incorrect (this is a liver function) -the liver synthesizes and secretes bile.
C. Formation of urea: Incorrect (this is a liver function) -the liver converts ammonia to urea (urea cycle).
D. Secretion of insulin: insulin is produced and secreted by the pancreatic β-cells, not the liver, so this is not a liver function.

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