1.3.3 Absorption

• The methods of absorption include diffusion, osmosis, and active transport
• Match the nutrient with its absorbed form:

  Carbohydrates ↔️ Glucose

  Proteins ↔️ Amino acids

  Fats ↔️ Fatty acids

  Vitamins and Minerals ↔️ Various forms
• Which digestive organ is the primary site for water and salt absorption?

  Large intestine
• The small intestine absorbs glucose, amino acids, fatty acids, glycerol, vitamins, minerals, and water
• Which digestive organ is specially designed for efficient absorption due to its large surface area created by villi and microvilli?

  Small intestine
• The large intestine concentrates undigested material into feces.


  True
• Arrange the digestive organs in order of their primary role in absorption, from most to least significant.

  1️⃣ Small Intestine

  2️⃣ Large Intestine

  3️⃣ Stomach
• The small intestine is highly specialized for absorption due to its large surface area and rich blood supply
• In diffusion, molecules move from an area of high concentration to an area of low concentration
• Match the transport protein with its mechanism:

  Carrier proteins ↔️ Bind and change shape

  Channel proteins ↔️ Form pores

  Active transport proteins ↔️ Use ATP energy
• The small intestine is the primary site for absorption of nutrients such as glucose, amino acids, and fatty acids
• What is the function of villi in the small intestine?

  Increase surface area
• Order the main methods of absorption by their role in nutrient movement.

  1️⃣ Diffusion

  2️⃣ Osmosis

  3️⃣ Active transport
• Channel proteins form pores that allow the passage of specific ions
• How are amino acids transported into the bloodstream?

  Active transport
• Absorption primarily occurs in the small intestine due to its specialized structures and processes.


  True
• What is the main function of the large intestine in terms of absorption?

  Water and salt absorption
• Microvilli and transport proteins play a role in absorption.

  True
• The large intestine mainly absorbs water and mineral salts
• Water is absorbed in both the small and large intestines.


  True
• Match the digestive organ with its main function:

  Stomach ↔️ Temporary storage

  Small Intestine ↔️ Primary site for absorption

  Large Intestine ↔️ Water and salt absorption
• Proteins are absorbed as amino acids
• The large intestine mainly absorbs water and mineral salts
• Absorption is the process by which digested food molecules move from the digestive system into the blood and lymphatic vessels
• Villi and microvilli in the small intestine increase its surface area for absorption.

  True
• Which absorption method involves the movement of water molecules through a semi-permeable membrane?

  Osmosis
• What does the large intestine help concentrate into feces?

  Undigested material
• What is the main function of the large intestine in absorption?

  Water and salt absorption
• Microvilli extend from the villi to further increase the surface area
• Microvilli enhance nutrient absorption by increasing the surface area of intestinal cells.

  True
• Which type of transport protein uses ATP to move nutrients against their concentration gradient?

  Active transport protein
• Fatty acids are converted into chylomicrons and travel via the lymphatic system
• Which macronutrient is absorbed as fatty acids and glycerol in the small intestine?

  Fats
• What is the main location where absorption occurs in the digestive system?

  Small intestine
• What is the primary function of absorption in the digestive system?

  Moves food molecules into blood
• Villi and microvilli in the small intestine increase the surface area for absorption.


  True
• What are the finger-like projections in the small intestine called that increase surface area?

  Villi
• The thin epithelium of the small intestine facilitates the easy passage of nutrients.

  True
• Match the nutrient with its absorbed form:

  Carbohydrates ↔️ Glucose

  Proteins ↔️ Amino acids

  Fats ↔️ Fatty acids

  Vitamins and Minerals ↔️ Various forms
• What are the main nutrients absorbed in the small intestine?

  Carbohydrates, proteins, fats