What do Micronemes do?

Micronemes are located on the apical third of the protozoan body. They are surrounded by a typical unit membrane. On electron microscopy they have an electron-dense matrix due to the high protein content. They are specialized secretory organelles important for host-cell invasion and gliding motility.

What do Rhoptries do?

Summary. Rhoptries are unique secretory organelles shared by all Apicomplexan invasive stages. They are exocytosed upon host cell invasion and their contents are involved in creating the moving junction that propels the parasite in the cell and in building the parasitophorous vacuole in which the parasite will develop.

What does the apical complex do?

The apical complex is instrumental in the host cell invasion processes [6], [7]. It provides both a semi-rigid framework to these apically pointed cells, and a focal point for secretory organelles that release various invasion factors that mediate interaction with, and invasion of, the host cell.

What do polar rings do?

These secrete enzymes that allow the parasite to enter other cells. The tip is surrounded by a band of microtubules, called the polar ring, and among the Conoidasida is also a funnel of tubulin proteins called the conoid.

What is the function of the pancreas endocrine system?

Figure 17.9.1 – Pancreas Pancreas endocrine function involves the secretion of insulin (produced by beta cells) and glucagon (produced by alpha cells) within the pancreatic islets. These two hormones regulate the rate of glucose metabolism in the body. The micrograph reveals pancreatic islets. LM × 760.

What does the acinar cell do in the pancreas?

The acinar cells are specialized to synthesize, store, and secrete digestive enzymes into a lumen space that is connected to the ductal system (Figure 4). The acinar cell has receptors for hormones and neurotransmitters that regulate the secretion of digestive enzymes into the lumen space (40).

How are PaSCs involved in normal pancreatic function?

In normal function PaSCs are involved in directing proper formation of the epithelial structures. In pathologic states such as chronic pancreatitis and pancreatic cancer the PaSC is transformed into a proliferating myofibroblastic cell type that synthesizes and secretes extracellular matrix proteins,…

What kind of proteins are secreted by microneme?

They are specialized secretory organelles important for host-cell invasion and gliding motility. These organelles secrete several proteins such as the Plasmodium falciparum apical membrane antigen-1, or PfAMA1, and Erythrocyte family antigen, or EBA, family proteins.