What is secretory in cell?

What is secretory in cell?

Abstract. Secretory cells and tissues are concerned with the accumulation of metabolism by products which are not used as reserve substances. Most secretory cells are specialized cells derived from elements belonging to other tissues, mainly epidermis or parenchymatous tissues.

What is the function of the secretory pathway?

Abstract. The secretory pathway carries proteins to the cell surface membrane where they can be released. For many proteins, this transport process happens at a relatively constant rate that is determined by how quickly those proteins are synthesized.

Is Golgi apparatus present in secretory cell?

The Cell: Basic Structure and Function It consists of stacked membrane-coated cavities, called dictyosomes (Fig. 1.4B). The Golgi apparatus is located close to the nucleus and can be very large in secretory cells, where it fills almost the complete cytoplasm.

What are the types of secretory cells?

Four major types of secretory epithelial cells cover the surface of the stomach and extend down into gastric pits and glands:

• Mucous cells: secrete an alkaline mucus that protects the epithelium against shear stress and acid.
• Parietal cells: secrete hydrochloric acid.
• Chief cells: secrete pepsin, a proteolytic enzyme.

Where do secretory proteins go?

Proteins destined to be secreted move through the secretory pathway in the following order: rough ER → ER-to-Golgi transport vesicles → Golgi cisternae → secretory or transport vesicles → cell surface (exocytosis) (see Figure 17-13).

What are the steps of secretory pathway?

Where are the secretory cells located in the cell?

These organelles are the rough endoplasmic reticulum and the Golgi apparatus. The nuclear membrane of secretory cells generally has more pores to allow the intense traffic of molecules related to protein synthesis between the cytoplasm and the nucleus.

How are secretory proteins modified in the Golgi apparatus?

As the secretory proteins move through the Golgi apparatus, a number of chemical modifications may transpire. Important among these is the modification of carbohydrate groups. Also within the Golgi or secretory vesicles are proteases that cut many secretory proteins at specific amino acid positions.

Where does the fusion of secretory vesicles take place?

For example, a nerve cell impulse triggers the fusion of secretory vesicles to the membrane at the nerve terminal, where the vesicles release neurotransmitters into the synaptic cleft (the gap between nerve endings).

Why are there more pores in secretory cells?

The nuclear membrane of secretory cells generally has more pores to allow the intense traffic of molecules related to protein synthesis between the cytoplasm and the nucleus. Cell Secretion Review – Image Diversity: rough endoplasmic reticulum Golgi apparatus