Tissues and Organs Flashcards
What is the Ileum?
The alimentary canal, part of the digestive system that forms the long hollow tube found in the intestine.
How many layers does the Ileum have?
Five layers.
What are the names of the layers in the Ileum?
The serosa, muscularis externa, submucosa, muscularis mucosa and mucosa.
What does the Serosa provide?
Provides a very thin protective and supportive lining for the alimentary canal.
What does the muscularis externa consist of?
An outer layer of longitudinal muscle and an inner layer of circular muscle.
What action helps churn and mix the food in the Ileum?
Contractions of the longitudinal muscle cause pendular movement and contractions of local constrictions.
What is the submucosa largely composed of?
connective tissue and contains many blood vessels and lymphatic vessels (crucial in transporting adsorbed food products).
What and where is the muscularis mucosa?
A thin layer of muscle which lies between the submucosa and the mucosa.
What is the muscularis submucosa important for?
In moving the villi that are present in the mucosa thus increasing contact with digested food in the gut lumen.
What is the mucosa?
The layer in contact with the food in the gut lumen.
What makes the surface area of the mucosa large?
The presence of villi and microvilli.
Where are the goblet cells found and what do they do?
Dotted within the columnar epithelium, they secrete mucus.
What do the capillaries inside the villi transport?
Amino acids and monosaccharides.
What are crypts of Lieberkuhn?
Intestinal glands that are embedded in the tissue between villi.
Where is the Paneth cell found?
The base of the Crypts.
What is the purpose of the Paneth cell?
An anti-microbial function in protecting their neighbouring active cells.
What is the primary organ in a plant for photosynthesis?
The leaf.
How is the leaf adapted for photosynthesis?
Chlorophyll which traps sunlight.
