What is the function of the endoplasmic reticulum in a muscle cell?
Skeletal muscle has a specialized form of ER known as sarcoplasmic reticulum (SR). The SR is a storage depot for calcium and regulates its release during myofibrillar contraction; hence, the SR has a critical role in muscle contraction and the maintenance of muscle homeostasis.
Can you see the endoplasmic reticulum with an electron microscope?
The rough endoplasmic reticulum (RER) is so named because the ribosomes attached to its cytoplasmic surface give it a studded appearance when viewed through an electron microscope.
Do smooth muscle cells have Golgi apparatus?
In smooth muscle cells the sarcoplasmic reticulum/endoplasmic reticulum (SR/ER) complex comprises about 5% of the total cell volume, with a considerable amount of rough endoplasmic reticulum and golgi apparatus adjacent to the nucleus, which reflects the significant capacity that smooth muscle has for protein synthesis …
Do muscle cells have RER?
In muscle cells, the smooth endoplasmic reticulum regulates calcium ion storage. The smooth endoplasmic reticulum like the rough endoplasmic reticulum is connected to the nuclear envelope. The smooth endoplasmic reticulum comprises tube-like structure located near the cell periphery.
Is mitochondria visible under electron microscope?
Mitochondria are visible under the light microscope although little detail can be seen. Transmission electron microscopy (left) shows the complex internal membrane structure of mitochondria, and electron tomography (right) gives a three-dimensional view.
Which cell structure can be seen only with an electron microscope?
Ribosomes
Mitochondria are visible with the light microscope but can’t be seen in detail. Ribosomes are only visible with the electron microscope.
Do smooth muscle cells have sarcoplasmic reticulum?
The sarcoplasmic reticulum (SR) of smooth muscles presents many intriguing facets and questions concerning its roles, especially as these change with development, disease, and modulation of physiological activity.
Does skeletal muscle have Myofilaments?
Skeletal muscles are composed of striated subunits called sarcomeres, which are composed of the myofilaments actin and myosin.
What is the relationship between ribosomes and rough endoplasmic reticulum ER )?
The rough endoplasmic reticulum has on it ribosomes, which are small, round organelles whose function it is to make those proteins. Sometimes, when those proteins are made improperly, the proteins stay within the endoplasmic reticulum.
What is the rough endoplasmic reticulum?
Rough Endoplasmic Reticulum: This transmission electron micrograph shows the rough endoplasmic reticulum and other organelles in a pancreatic cell. The rough endoplasmic reticulum (RER) is so named because the ribosomes attached to its cytoplasmic surface give it a studded appearance when viewed through an electron microscope.
What is the lumen of the endoplasmic reticulum?
The endoplasmic reticulum (ER) is a series of interconnected membranous sacs and tubules that collectively modifies proteins and synthesizes lipids. However, these two functions are performed in separate areas of the ER: the rough ER and the smooth ER. The hollow portion of the ER tubules is called the lumen or cisternal space.
What are the two parts of the endoplasmic reticulum?
The endoplasmic reticulum (ER) is a series of interconnected membranous sacs and tubules that collectively modifies proteins and synthesizes lipids. However, these two functions are performed in separate areas of the ER: the rough ER and the smooth ER.
What is the function of the smooth endoplasmic reticulum Quizlet?
Functions of the smooth endoplasmic reticulum include synthesis of carbohydrates, lipids, and steroid hormones; detoxification of medications and poisons; and storage of calcium ions. lumen: The cavity or channel within a tube or tubular organ.