NU 545 Unit 6 Digestive EXAM | QUESTIONS AND ANSWERS | VERIFIED ANSWERS
GRADED A+ | LATEST EXAM 2025/2026
What is the primary function of the digestive system? - CORRECT
ANSWER- To convert food into smaller units that the body can absorb and
use.
What are the main components of food that the digestive system
processes? - CORRECT ANSWER- Proteins, fats, carbohydrates, and
nucleic acids.
What does the digestive system provide to the body? - CORRECT
ANSWER- Nutrients, water, minerals, and vitamins essential for cell health.
What is the alimentary canal? - CORRECT ANSWER- A hollow tube that
extends from the mouth to the anus.
What are the two groups of organs in the digestive system? - CORRECT
ANSWER- Alimentary canal and accessory digestive organs.
Name three organs that are part of the alimentary canal. - CORRECT
ANSWER- Mouth, esophagus, stomach.
What role do accessory digestive organs play? - CORRECT ANSWER-
They assist the alimentary canal in the mechanical and chemical
breakdown of food.
What is peristalsis? - CORRECT ANSWER- The wave-like muscle
contractions that move food through the digestive tract.
What is segmentation in the digestive system? - CORRECT ANSWER-
The contraction of circular muscles in the digestive tract that mixes food.
What are the four layers of the alimentary canal wall? - CORRECT
ANSWER- Mucosa, submucosa, muscularis externa, and serosa.
What is the function of the mucosa layer? - CORRECT ANSWER- It
absorbs nutrients and secretes mucus.
, What does the submucosa layer contain? - CORRECT ANSWER- Major
blood and lymphatic vessels, nerve fibers, and some glands.
What is the muscularis externa responsible for? - CORRECT ANSWER-
Squeezing and shortening the gut tube through smooth muscle
contractions.
What is the serosa? - CORRECT ANSWER- The protective outermost
layer of the alimentary canal.
What is the role of the oral cavity in digestion? - CORRECT ANSWER- It is
where food enters the alimentary canal, is chewed, and mixed with saliva.
What are the two parts of the palate? - CORRECT ANSWER- Hard palate
and soft palate.
What is the function of the tongue in digestion? - CORRECT ANSWER- It
grips food, repositions it, mixes it with saliva, and forms a bolus.
What are papillae on the tongue? - CORRECT ANSWER- Peg-like
projections that contain taste buds.
What type of epithelium lines the oral cavity? - CORRECT ANSWER-
Stratified squamous epithelium.
What is the role of taste buds? - CORRECT ANSWER- They contain
gustatory cells that detect taste.
Where are taste buds primarily located? - CORRECT ANSWER- In the
mucosa of the tongue, palate, and inner cheeks.
What is the uvula's function? - CORRECT ANSWER- It rises to close off
the nasopharynx during swallowing.
What is the significance of the muscularis mucosae? - CORRECT
ANSWER- It dislodges food particles within the digestive tract.
What is the function of the gallbladder? - CORRECT ANSWER- To store
and concentrate bile produced by the liver.
GRADED A+ | LATEST EXAM 2025/2026
What is the primary function of the digestive system? - CORRECT
ANSWER- To convert food into smaller units that the body can absorb and
use.
What are the main components of food that the digestive system
processes? - CORRECT ANSWER- Proteins, fats, carbohydrates, and
nucleic acids.
What does the digestive system provide to the body? - CORRECT
ANSWER- Nutrients, water, minerals, and vitamins essential for cell health.
What is the alimentary canal? - CORRECT ANSWER- A hollow tube that
extends from the mouth to the anus.
What are the two groups of organs in the digestive system? - CORRECT
ANSWER- Alimentary canal and accessory digestive organs.
Name three organs that are part of the alimentary canal. - CORRECT
ANSWER- Mouth, esophagus, stomach.
What role do accessory digestive organs play? - CORRECT ANSWER-
They assist the alimentary canal in the mechanical and chemical
breakdown of food.
What is peristalsis? - CORRECT ANSWER- The wave-like muscle
contractions that move food through the digestive tract.
What is segmentation in the digestive system? - CORRECT ANSWER-
The contraction of circular muscles in the digestive tract that mixes food.
What are the four layers of the alimentary canal wall? - CORRECT
ANSWER- Mucosa, submucosa, muscularis externa, and serosa.
What is the function of the mucosa layer? - CORRECT ANSWER- It
absorbs nutrients and secretes mucus.
, What does the submucosa layer contain? - CORRECT ANSWER- Major
blood and lymphatic vessels, nerve fibers, and some glands.
What is the muscularis externa responsible for? - CORRECT ANSWER-
Squeezing and shortening the gut tube through smooth muscle
contractions.
What is the serosa? - CORRECT ANSWER- The protective outermost
layer of the alimentary canal.
What is the role of the oral cavity in digestion? - CORRECT ANSWER- It is
where food enters the alimentary canal, is chewed, and mixed with saliva.
What are the two parts of the palate? - CORRECT ANSWER- Hard palate
and soft palate.
What is the function of the tongue in digestion? - CORRECT ANSWER- It
grips food, repositions it, mixes it with saliva, and forms a bolus.
What are papillae on the tongue? - CORRECT ANSWER- Peg-like
projections that contain taste buds.
What type of epithelium lines the oral cavity? - CORRECT ANSWER-
Stratified squamous epithelium.
What is the role of taste buds? - CORRECT ANSWER- They contain
gustatory cells that detect taste.
Where are taste buds primarily located? - CORRECT ANSWER- In the
mucosa of the tongue, palate, and inner cheeks.
What is the uvula's function? - CORRECT ANSWER- It rises to close off
the nasopharynx during swallowing.
What is the significance of the muscularis mucosae? - CORRECT
ANSWER- It dislodges food particles within the digestive tract.
What is the function of the gallbladder? - CORRECT ANSWER- To store
and concentrate bile produced by the liver.
