About This Chapter
ASVAB: The Human Digestive System - Chapter Summary
Go through this chapter's lessons on topics such as the anatomy of the mouth, throat and esophagus as you're developing a broad understanding of the digestive system. More ASVAB test prep lessons in the chapter that help you grasp the workings of this major body system include:
- Anatomy of the large intestine and stomach
- The functions of the large intestine
- Upper and lower gastrointestinal tracts
- The three sections of the small intestine
- The role of the small intestine in digestion
Explore the short and fun video lessons to learn about each of these important human digestive system topics. After exploring each chapter lesson, you can gauge how comfortable you are with the material by taking a quick practice quiz.
Objectives of the ASVAB: The Human Digestive System Chapter
The ASVAB is set up to determine whether the military is a good fit for you according to the score you receive. This chapter on the human digestive system is designed to help you with content that you may see in the General Science (GS) subtest. All questions in the GS subtest are going to have the same multiple-choice format as the questions you can answer in this chapter for practice. The computerized GS subtest contains 16 questions and the paper test has 25 questions.
1. Digestive System I: The Upper Gastrointestinal Tract
Did you know that there are digestive enzymes in your saliva? It's true. As soon as you put a piece of food in your mouth, the digestive process begins. Join us with this first of two lessons about the human digestive system, where we'll follow food through the upper gastrointestinal tract from the mouth through the stomach.
2. Digestive System II: The Lower Gastrointestinal Tract
The lower gastrointestinal tract is the part of the digestive system that is responsible for the last part of food digestion and the expulsion of waste from the body. In this lesson, we'll look at each part of the system and what functions each serves in the process of digestion.
3. Anatomy and Physiology of the Mouth
The digestive system is a long tube that breaks food down both mechanically and chemically. In this lesson, you will learn about the mouth and how it begins the digestive process - with the help of the teeth and the enzyme called salivary amylase.
4. Anatomy of the Throat and Esophagus
After food has been partially broken down in the mouth, it moves through the pharynx, or throat, and the esophagus. In this lesson, you will learn how food is swallowed and how it is propelled by peristalsis through the esophagus.
5. Anatomy and Physiology of the Stomach and Autonomic Nervous System Controls
In this lesson, you will learn how the unique anatomy of the stomach - including rugae, gastric pits and gastric glands - makes it a perfect organ for digestion. You will also learn how the autonomic nervous system controls digestion.
6. What is the Small Intestine? - Anatomy and Functions
In this lesson, you will learn about the three divisions of the small intestine - the duodenum, jejunum, and ileum. You will also gain an understanding of the basic functions of each of these sections, including their role in removing bacteria.
7. Small Intestine: Nutrient Absorption and Role In Digestion
The majority of digestion and absorption of nutrients takes place in the small intestine. In this lesson, you will learn about unique modifications within the walls of the small intestine, such as microvilli, villi, and circular folds. These structures increase absorption of nutrients.
8. Anatomy and Physiology of the Large Intestine
The large intestine is the made up of the cecum, colon, rectum and anal canal. In this lesson, you will learn about the anatomical features and basic functions of these large intestine segments.
9. Rectum, Functions of the Large Intestine & Water Absorption
The large intestine is the final processing area for digested food. In this lesson, you will learn how the large intestine removes water from undigested food and prepares for the elimination of feces through the anus.
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Other chapters within the ASVAB Armed Services Vocational Aptitude Battery: Practice & Study Guide course
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- ASVAB: The Human Nervous System
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