Digestion and Excretion Flashcards
What’s the main digestive tract called?
The alimentary canal
What are the three segments of the alimentary canal?
The foregut, midgut, and hindgut
What sections of the the alimentary canal are replaced during molting?
The foregut and hindgut, ectoderm development
What are the parts of the foregut?
The preoral cavity, the pharynx, the esophagus, the crop, and the proventriculus
What is the preoral cavity?
The space inside the head of the insect used in sucking up food, made of cibarium, salivarium and dilator muscles
What is Extra-Intestinal digestion?
It is the digestion of food that occurs outside the stomach, by for example saliva
What is the purpose of the proventriculus?
To act as a sphincter preventing boluses from continuing on to the midgut and also used for additional mechanical digestion
What are the parts of the midgut?
Gastric Caecae, Single cell Epithelium, Peritrophic membrance, pyloric valve
What is the peritrophic membrane?
Selectively permeable membrane in the midgut formed by floating chains of chitin, allows passage of enzymes and digested nutrients but not food bolus
Which space is the endoperiotrphic space?
The endoperiotrophic space is that space contained by that membrane encompassing the food bolus.
Where are midgut microvilli found?
On the single cell layer epithelium, used to absorb nutrients
What is a filter chamber?
An adaptation used by insects with high water diets to help retain nutrients that may be lost to osmosis
What symbionts can be found in the digestive tract?
Bacteria, protozoa and fungi, can be lost in molting
What part of the digestive tract are symbionts found?
the Hindgut
What makes up the hindgut
Malphigian tubules, Ileum, Colon, Rectum, anus
