Question 1:
Where does the majority of nutrient absorption take place in the digestive system?
Explanation: The majority of nutrient absorption takes place in the small intestine. The inner lining of the small intestine is highly specialized for absorption, with finger-like projections called villi and microvilli that increase the surface area for nutrient absorption.
Question 2:
Which nutrient is primarily absorbed in the stomach?
Explanation: None of the nutrients are primarily absorbed in the stomach. While some substances, such as alcohol and certain drugs, can be partially absorbed in the stomach, the significant absorption of nutrients occurs in the small intestine.
Question 3:
Which of the following mechanisms is responsible for the absorption of most nutrients?
Explanation: The mechanism responsible for the absorption of most nutrients is active transport. Active transport requires the use of energy to transport nutrients across the intestinal lining against their concentration gradients.
Question 4:
How are water-soluble nutrients transported from the small intestine to the bloodstream?
Explanation: Water-soluble nutrients are transported from the small intestine to the bloodstream via the hepatic portal vein. The hepatic portal vein carries the absorbed nutrients directly to the liver for processing before they enter the general circulation.
Question 5:
Which of the following nutrients is primarily absorbed in the large intestine?
Explanation: The large intestine primarily absorbs water and electrolytes. It plays a crucial role in reabsorbing water and maintaining the body's fluid balance, while the majority of nutrient absorption occurs in the small intestine.
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