ATI TEAS PrAcTIcE TEST: DIgESTIvE & EnDocrInE SySTEmS (2026
EDITIon)|| QuESTIonS AnD AnSwErS wITh rATIonAlES/grADED
A+/2026 uPDATE/100% corrEcT
Digestive System (Questions 1–13)
Question 1
Which of the following is the correct order of food travel through the digestive tract?
A) Esophagus → stomach → duodenum → jejunum → ileum
B) Stomach → esophagus → jejunum → ileum → cecum
C) Duodenum → stomach → jejunum → ileum → colon
D) Ileum → jejunum → duodenum → stomach → esophagus
**Answer:** A) Esophagus → stomach → duodenum → jejunum → ileum
**Rationale:** Food passes from the esophagus to the stomach, then to the small intestine in order: duodenum (first
part), jejunum (middle), ileum (last part). The large intestine (cecum/colon) follows.
---
### Question 2
Which digestive enzyme is produced by the salivary glands and begins starch digestion in the mouth?
A) Pepsin
B) Amylase
C) Lipase
D) Trypsin
**Answer:** B) Amylase
, **Rationale:** Salivary amylase (ptyalin) breaks down starch into maltose. Pepsin (stomach) digests protein, lipase
(pancreas) digests fat, and trypsin (pancreas) digests protein in the small intestine.
---
### Question 3
The majority of nutrient absorption occurs in which part of the digestive system?
A) Stomach
B) Large intestine
C) Small intestine
D) Esophagus
**Answer:** C) Small intestine
**Rationale:** The small intestine has villi and microvilli that greatly increase surface area for absorption of
carbohydrates, proteins, fats, vitamins, and minerals. The stomach absorbs alcohol and some drugs; the large
intestine absorbs water and electrolytes.
---
### Question 4
What is the primary function of hydrochloric acid (HCl) in the stomach?
A) Emulsify fats
B) Absorb vitamin B12
C) Activate pepsinogen to pepsin and kill pathogens
D) Neutralize stomach contents
**Answer:** C) Activate pepsinogen to pepsin and kill pathogens
EDITIon)|| QuESTIonS AnD AnSwErS wITh rATIonAlES/grADED
A+/2026 uPDATE/100% corrEcT
Digestive System (Questions 1–13)
Question 1
Which of the following is the correct order of food travel through the digestive tract?
A) Esophagus → stomach → duodenum → jejunum → ileum
B) Stomach → esophagus → jejunum → ileum → cecum
C) Duodenum → stomach → jejunum → ileum → colon
D) Ileum → jejunum → duodenum → stomach → esophagus
**Answer:** A) Esophagus → stomach → duodenum → jejunum → ileum
**Rationale:** Food passes from the esophagus to the stomach, then to the small intestine in order: duodenum (first
part), jejunum (middle), ileum (last part). The large intestine (cecum/colon) follows.
---
### Question 2
Which digestive enzyme is produced by the salivary glands and begins starch digestion in the mouth?
A) Pepsin
B) Amylase
C) Lipase
D) Trypsin
**Answer:** B) Amylase
, **Rationale:** Salivary amylase (ptyalin) breaks down starch into maltose. Pepsin (stomach) digests protein, lipase
(pancreas) digests fat, and trypsin (pancreas) digests protein in the small intestine.
---
### Question 3
The majority of nutrient absorption occurs in which part of the digestive system?
A) Stomach
B) Large intestine
C) Small intestine
D) Esophagus
**Answer:** C) Small intestine
**Rationale:** The small intestine has villi and microvilli that greatly increase surface area for absorption of
carbohydrates, proteins, fats, vitamins, and minerals. The stomach absorbs alcohol and some drugs; the large
intestine absorbs water and electrolytes.
---
### Question 4
What is the primary function of hydrochloric acid (HCl) in the stomach?
A) Emulsify fats
B) Absorb vitamin B12
C) Activate pepsinogen to pepsin and kill pathogens
D) Neutralize stomach contents
**Answer:** C) Activate pepsinogen to pepsin and kill pathogens
