Their stomachs turn prey into liquid very rapidly. Their intestine has digestive enzymes that further break down food. As a result they can almost completely digest the seals and other mammals they feed on. Bubacar Goedecken Pundit. What is the role of the gastric Caeca in a grasshopper? Maragda Illguth Pundit. What does the esophagus do in a grasshopper? The grasshopper's digestive tract is specialized to eat plant tissue. The mouth parts hold, crush, and chew the food before it passes into the mouth.
From the mouth the food passes through the esophagus into the crop. The food is stored in the crop. Imma Sornoza Pundit. Why is the midgut not lined with cuticle? Because the cells in the midgut epithelium are derived from embryonic endoderm, the midgut is not lined with cuticle. Most of the cells in the midgut are involved in the secretion of digestive fluids and the absorption of nutrients from the midgut lumen. Beneamin Schmidmaier Teacher.
What is the function of the intestine in a grasshopper? Collect wastes from the body cavity and excrete the wastes into the intestine. Tube running from the stomach to the anus. It absorbs and transports digested food. Isobel Cando Supporter. What is the function of gizzard?
Gizzard, in many birds, the hind part of the stomach , especially modified for grinding food. Located between the saclike crop and the intestine, the gizzard has a thick muscular wall and may contain small stones, or gastroliths, that function in the mechanical breakdown of seeds and other foods.
Linnea Hutwohl Supporter. Which part of the insect digestive system is important for excretion of waste? The Malpighian tubule system is a type of excretory and osmoregulatory system found in some insects , myriapods, arachnids, and tardigrades. What does the grasshopper stomach do? What is the function of a grasshoppers stomach? People also asked. In grasshoppers what is the role of the gastric caeca?
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All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Answers. The muscle layer consists of an inner substratum of circular muscle and an outer sheath of longitudinal muscle Fig 6C , which are embedded inside and out by the basal lamina.
Tracheolar cells were also observed here Fig 6B. Two secretory devices, merocrine and apocrine, were found in the apical membrane of principal cells Fig 8A—8D. The merocrine devices usually bud to form microvilli and release secretions into the gut lumen Fig 8C. The apocrine devices have two different shapes: 1 a bulb-shaped bubble with a smooth surface Fig 8A and 8B , which is the most common shape among insects; and 2 a cylindrical-shaped apocrine bubble Fig 8A with the membrane surface developing regular longitudinal ridges Fig 8A , which primarily occurs in the portion with the gastric caeca.
However, secretion from both merocrine and bulb-shaped apocrine devices was observed along the entire midgut. A Secretory devices in the gastric caeca, SEM. B Secretory devices in the ventriculus, SEM.
C Merocrine secretion, TEM. D Apocrine secretion, TEM. E Holocrine secretion, TEM. Gastric caeca occurring in the midgut of many insects vary among taxa with regard to shape, number, size and position [ 2 ]. In Orthoptera, the caeca usually originate at the anterior end of the midgut. In Gryllidae, the two caeca are bulbous in shape [ 5 , 14 ], whereas six bi-lobed finger-shaped caeca occur in Caelifera [ 2 ].
The midgut of G. The gastric caeca originate at the anterior end of the ventriculus, similar to other members of Ensifera, e. Epithelial folds can increase the area of the midgut and are commonly observed in the gastric caeca. In grasshoppers, the epithelium of the caeca is folded into longitudinal ridges [ 2 , 10 — 12 ]. The epithelium of most insect midguts contains four cell types: principal, goblet, regenerative and endocrine [ 2 ]. Goblet cells are only found in the midguts of some insects, e.
Three midgut epithelial cell types, principal, regenerative and endocrine cells, were observed in G. Endocrine cells in insect midgut perform important roles by releasing various peptides in many key physiological functions, and the kind and distribution of regulatory peptides vary with different species [ 17 ].
Thus, further research in this area would be needed. Principal cells exhibit the cellular structures of classic secretory cells: microvilli, large nuclei, mitochondria, ribosomes, RER, Golgi complex, and vesicles [ 18 ]. Differences in the regional ultrastructure of principal cells were observed along the midgut of G.
Regional differences in the principal cells of G. Microvilli dramatically increase the apical membrane area of a cell for enzyme secretion and absorption of digested products, and in G. Therefore, high rates of absorption likely occur in the posterior midgut. Lipids play an important role in insects for energy storage for survival, development and subsequent reproduction [ 2 ]. Neutral lipids, digested and absorbed from food, consist predominantly of triacylglycerols or cholesteryl esters, and the core of lipid droplets is surrounded by a monolayer of phospholipids and associated proteins [ 21 , 22 ].
Lipid droplets are present in various cell types of all organisms, from prokaryotes to eukaryotes [ 16 , 22 , 23 ].
Our study revealed the highest concentration of lipid droplets in the gastric caeca of G. Therefore, gastric caeca are likely a vital part of the midgut involved in lipid accumulation, as observed in Abracris flavolineata Orthoptera: Acrididae [ 2 ] and Brontocoris tabidus Heteroptera: Pentatomidae [ 24 ].
The intracellular storage and use of lipids are critical for maintaining cellular energy homeostasis. Lysosomes, a type of membrane-bound organelle [ 25 ], perform multiple functions in addition to degradation, including energy metabolism, secretion and plasma membrane repair [ 26 ]. MVBs and autophagosomes are closely related to lysosomes in the cellular energy balance.
MVBs are a special type of late endosome that primarily separates and delivers proteins to lysosomes for degradation Fig 4A and 4C [ 27 ]. The proteins separated and delivered by MVBs vary for different cell types; for example, in mammotrophic hormone-producing cells of the rat anterior pituitary gland, MVBs regulate the secretory process by overproducing secretory granules [ 28 ].
During autophagy, cellular components are degraded in lysosomes Fig 4D , assuring the removal of altered or dysfunctional proteins and organelles [ 29 ]. Recent studies reveal that multiple mechanisms operate in the delivery of functional proteins and organelles to lysosomes [ 30 ].
One such mechanism is fusion of autophagosomes with MVBs to generate an amphisome, which fuses with the lysosome to degrade the material contained within [ 31 ]. Additionally, autophagosomes have a key role in lipid metabolism by shuttling lipid droplets to lysosomes Fig 4B , where they are hydrolyzed into free fatty acids and glycerol [ 29 , 32 ]. MVBs, lysosomes and autophagosomes and lipid droplets were found together in the principal cells of the gastric caeca in G.
Therefore, we propose the existence of a regulatory mechanism of lysosomes over secretory granules, with this mechanism being associated with intracellular lipid metabolism in G.
Principal cells, particularly those in the gastric caeca, show intense secretory activity, and their cytoplasm contains abundant organelles related to secretion, such as RER, Golgi and secretory vesicles [ 18 ].
Three mechanisms release the products of secretion, most likely including digestive enzymes and other proteins, into the midgut lumen [ 33 ]: a holocrine, b merocrine and c apocrine. During holocrine secretion, all secretory vesicles and the cytoplasm are released by rupture of the plasma membrane and cellular degradation.
In merocrine secretion, or exocytosis, the products in secretory vesicles reach the lumen via fusion of the limiting membrane of a vesicle with the apical membrane, without cytoplasm loss. In contrast, the mechanism for apocrine secretion involves loss of part of the apical cytoplasm as secretory vesicles are released. Further studies are required to ascertain whether these two types of apocrine blebs have different contents and functions.
In the present study, the morphology and structure of the midgut of G. The results showed that the midgut of G. The organizational structure of these two components is similar. Regional ultrastructural differences along the entire midgut were observed for principal cells, such as in the gastric caeca, with abundant lysosomes, MVBs, autophagosomes, Golgi, lipid droplets and a type of distinctive apocrine bleb.
These structural differences suggest that the function of the gastric caeca is more similar to that of a specialized gland. Therefore, we suggest that the gastric caeca play an essential role in functions of secretion and energy storage, whereas an absorptive function may be more important for the ventriculus.
The undergraduate innovative experiment project of Shanxi Province of China provided the funding to support this research. The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Analytical Chemistry Video Lessons.
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