Which of the following statements about the process of...

Name: Problem 22, Chapter 25: Biology for AP Courses
Uploaded: 2019-08-18T16:07:55-08:00
Duration: 2 min 8 s
Channel: James Thierer
Description: Which of the following statements about the process of digestion is true? a. Organisms absorb large molecules through digestive cells. b. The last step of digestion is absorption. c. Food is only mechanically broken down in the mouth. d. Food is prepared into a bolus before it is swallowed.

Which of the following statements about the process of digestion is true? a. Organisms absorb large molecules through digestive cells. b. The last step of digestion is absorption. c. Food is only mechanically broken down in the mouth. d. Food is prepared into a bolus before it is swallowed.

Which of the following statements about the process of digestion is true?

a. Organisms absorb large molecules through digestive cells.
b. The last step of digestion is absorption.
c. Food is only mechanically broken down in the mouth.
d. Food is prepared into a bolus before it is swallowed.

Key Concepts

Absorption

Absorption is the process in digestion where the nutrients derived from the breakdown of food are taken up by the cells of the digestive tract and then transported into the bloodstream. This typically occurs in the small intestine, where maximum nutrient uptake happens.

Bolus Formation

Bolus formation is the process where chewed food is mixed with saliva to create a soft, cohesive mass that can be easily swallowed. This is an essential preparatory step for ingestion, ensuring that the food can move safely through the esophagus into the stomach.

Ingestion

Ingestion is the initial stage of the digestive process, involving the intake of food and liquids into the body. This step marks the beginning of digestion and is followed by both mechanical and chemical breakdown, ultimately leading to nutrient absorption.

Mechanical Digestion

Mechanical digestion refers to the physical processes that break down food into smaller pieces without altering its chemical structure. This includes actions like chewing in the mouth and the churning movements in the stomach, which help increase the surface area of food for more efficient chemical digestion.

Chemical Digestion

Chemical digestion involves the breakdown of large food molecules into smaller, absorbable units by enzymes and other digestive chemicals. This process occurs throughout the digestive tract, starting in the mouth with enzymes in saliva and continuing in the stomach and intestines with other specialized enzymes.

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