Multiple Choice
What enzyme is responsible for digesting emulsified fats in the digestive system?
193
views
23. The Digestive System
Introduction to the Digestive System
Struggling with Anatomy & Physiology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which layer of the digestive tract is in direct contact with ingested food?
A
Submucosa
B
Mucosa
C
Muscularis externa
D
Serosa
Verified step by step guidance1
Understand the structure of the digestive tract, which consists of four main layers: mucosa, submucosa, muscularis externa, and serosa.
Recognize that the mucosa is the innermost layer of the digestive tract and is directly exposed to the contents within the lumen, including ingested food.
The mucosa itself is composed of three sub-layers: the epithelium, lamina propria, and muscularis mucosae. The epithelium is the specific sub-layer that comes into direct contact with food.
The submucosa is the layer just outside the mucosa and contains blood vessels, nerves, and glands, but it does not directly contact food.
The muscularis externa and serosa are outer layers that play roles in movement and protection, respectively, but do not contact ingested food directly.
6:28mWatch next
Master Organs of the Digestive System with a bite sized video explanation from Bruce Bryan
Start learningRelated Videos
Related Practice
Introduction to the Digestive System practice set
Problem sets built by lead tutorsExpert video explanations