Human Digestive System Quiz

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Which gland is responsible for producing saliva in the mouth?

Liver

Pancreas

Gallbladder

Parotid gland (correct)

Which part of the alimentary tract is responsible for mechanical digestion of food?

Esophagus

Duodenum

Jejunum

Stomach (correct)

Which part of the colon is located near the anus?

Ascending colon

Transverse colon

Descending colon (correct)

Rectum

Which organ is responsible for producing bile that helps in fat digestion?

Liver Signup and view all the answers

Which part of the alimentary tract receives bile from the liver and pancreatic juice from the pancreas?

Duodenum Signup and view all the answers

What is the characteristic of gastric smooth muscle?

It functions as a syncytium Signup and view all the answers

What is the length of individual smooth muscle fibers in the gut?

200 to 500μm Signup and view all the answers

How are the smooth muscle fibers arranged in the gut?

As many as 1000 parallel fibers in bundles Signup and view all the answers

What is the orientation of the bundles in the longitudinal muscle layer?

They extend longitudinally down the intestinal tract Signup and view all the answers

What is the main determinant of the rhythm of GIT contractions?

Frequency of slow waves Signup and view all the answers

What is the orientation of the bundles in the circular muscle layer?

They extend around the gut Signup and view all the answers

What is the typical range of intensity of slow waves in the GIT?

5-15 millivolts Signup and view all the answers

What is the frequency of slow waves in the duodenum?

12 per minute Signup and view all the answers

What is the frequency of slow waves in the body of the stomach?

3 per minute Signup and view all the answers

What type of changes in the resting membrane potential are slow waves?

Slow, undulating changes Signup and view all the answers

What allows for the movement of ions between muscle cells within a bundle?

Gap junctions Signup and view all the answers

In what direction do electrical signals travel more rapidly within a bundle?

Along the length of the bundle Signup and view all the answers

What is the function of the loose connective tissue between muscle bundles?

To partially separate adjacent muscle bundles Signup and view all the answers

What is the term used to describe the functioning of the smooth muscle layer as a whole?

Syncytium Signup and view all the answers

What is the result of the fusion of muscle bundles at many points?

A branching mesh of smooth muscle bundles Signup and view all the answers

What happens to the membrane muscle fibers when the potential becomes less negative?

They become more excitable Signup and view all the answers

What is the effect of stretching of the muscle on the membrane?

It depolarizes the membrane Signup and view all the answers

Which of the following stimulates the membrane, making it more excitable?

Release of acetylcholine from the endings of parasympathetic nerves Signup and view all the answers

What is the effect of hyperpolarization on the muscle fibers?

They become less excitable Signup and view all the answers

Which of the following is NOT a factor that depolarizes the membrane?

Stimulation by sympathetic nerves Signup and view all the answers