Cellular Structure and Function
Diapedesis and Phagocytosis Processes
Diapedesis: The movement of white blood cells from the bloodstream to
the tissues.
Phagocytosis: The process by which certain white blood cells (phagocytes)
engulf and digest foreign particles, bacteria, or dead cells.
Cell Division and Chromosome Separation
Mitosis: A type of cell division that results in two daughter cells each
having the same number and kind of chromosomes as the parent nucleus.
Chromosome Separation: The process of separating identical copies of
chromosomes into two daughter cells during cell division.
The Nucleus: Brain of the Cell
Contains most of the cell’s genetic material.
Controls the cell’s growth and reproduction.
The Nucleus: Brain of the Cell
The nucleus is often referred to as the “brain” of the cell due to its vital
role in controlling cellular activities. It is a membrane-bound organelle
found in eukaryotic cells and contains the majority of the cell’s genetic
material in the form of chromosomes. The nucleus plays a crucial role in
cell division and chromosome separation.
Cell Division and Chromosome Separation
Cell division is the process by which a single cell divides into two identical
daughter cells. Chromosome separation occurs during cell division, where
replicated chromosomes are equally distributed to the two daughter cells.
This process is necessary for the growth, development, and reproduction
of organisms.
Rough Endoplasmic Reticulum (RER)
Site of Protein Synthesis
RER is an extensive network of membrane-enclosed tubules and sacs,
present in eukaryotic cells.
It is the site of synthesis for secreted and membrane-bound proteins.
RER has ribosomes attached to its cytoplasmic surface, giving it a “rough”
appearance.
, Ribosomes on RER
Ribosomes are complex macromolecular machines responsible for protein
synthesis.
Ribosomes on RER are engaged in the translation of messenger RNA
(mRNA) into proteins.
Transport to Golgi Apparatus
Proteins synthesized on RER are transported to the Golgi apparatus for
further processing.
This transport occurs in vesicles that bud off from the RER.
Excrete. The video “Cytochrome P450 and Drug Metabolism” provides an
engaging explanation of this process (watch it here).
The smooth endoplasmic reticulum (SER)
The smooth endoplasmic reticulum (SER) is an organelle in eukaryotic
cells that plays a crucial role in lipid synthesis and detoxification. Let’s
dive into these two functions with some examples.
Lipid Synthesis
The SER is the primary site for the synthesis of lipids, including
cholesterol, phospholipids, and triglycerides. These lipids are essential for
maintaining the structural integrity of cell membranes and serving as
energy storage molecules.
Cholesterol: Our story begins with HMG-CoA reductase, an enzyme
located in the SER. This enzyme kickstarts the process of cholesterol
synthesis by converting HMG-CoA into mevalonate. The video “Cholesterol
Biosynthesis” provides a step-by-step calculation of this reaction, which
you can view here.
Phospholipids: These lipids are essential components of cell
membranes, maintaining their fluidity and selective permeability. The SER
is responsible for synthesizing the phospholipid class called
glycerophospholipids. In the video “Phospholipid Biosynthesis,” you can
find a detailed explanation of how the SER creates glycerophospholipids
using glycerol-3-phosphate as the starting molecule (watch it here).
Detoxification
Diapedesis and Phagocytosis Processes
Diapedesis: The movement of white blood cells from the bloodstream to
the tissues.
Phagocytosis: The process by which certain white blood cells (phagocytes)
engulf and digest foreign particles, bacteria, or dead cells.
Cell Division and Chromosome Separation
Mitosis: A type of cell division that results in two daughter cells each
having the same number and kind of chromosomes as the parent nucleus.
Chromosome Separation: The process of separating identical copies of
chromosomes into two daughter cells during cell division.
The Nucleus: Brain of the Cell
Contains most of the cell’s genetic material.
Controls the cell’s growth and reproduction.
The Nucleus: Brain of the Cell
The nucleus is often referred to as the “brain” of the cell due to its vital
role in controlling cellular activities. It is a membrane-bound organelle
found in eukaryotic cells and contains the majority of the cell’s genetic
material in the form of chromosomes. The nucleus plays a crucial role in
cell division and chromosome separation.
Cell Division and Chromosome Separation
Cell division is the process by which a single cell divides into two identical
daughter cells. Chromosome separation occurs during cell division, where
replicated chromosomes are equally distributed to the two daughter cells.
This process is necessary for the growth, development, and reproduction
of organisms.
Rough Endoplasmic Reticulum (RER)
Site of Protein Synthesis
RER is an extensive network of membrane-enclosed tubules and sacs,
present in eukaryotic cells.
It is the site of synthesis for secreted and membrane-bound proteins.
RER has ribosomes attached to its cytoplasmic surface, giving it a “rough”
appearance.
, Ribosomes on RER
Ribosomes are complex macromolecular machines responsible for protein
synthesis.
Ribosomes on RER are engaged in the translation of messenger RNA
(mRNA) into proteins.
Transport to Golgi Apparatus
Proteins synthesized on RER are transported to the Golgi apparatus for
further processing.
This transport occurs in vesicles that bud off from the RER.
Excrete. The video “Cytochrome P450 and Drug Metabolism” provides an
engaging explanation of this process (watch it here).
The smooth endoplasmic reticulum (SER)
The smooth endoplasmic reticulum (SER) is an organelle in eukaryotic
cells that plays a crucial role in lipid synthesis and detoxification. Let’s
dive into these two functions with some examples.
Lipid Synthesis
The SER is the primary site for the synthesis of lipids, including
cholesterol, phospholipids, and triglycerides. These lipids are essential for
maintaining the structural integrity of cell membranes and serving as
energy storage molecules.
Cholesterol: Our story begins with HMG-CoA reductase, an enzyme
located in the SER. This enzyme kickstarts the process of cholesterol
synthesis by converting HMG-CoA into mevalonate. The video “Cholesterol
Biosynthesis” provides a step-by-step calculation of this reaction, which
you can view here.
Phospholipids: These lipids are essential components of cell
membranes, maintaining their fluidity and selective permeability. The SER
is responsible for synthesizing the phospholipid class called
glycerophospholipids. In the video “Phospholipid Biosynthesis,” you can
find a detailed explanation of how the SER creates glycerophospholipids
using glycerol-3-phosphate as the starting molecule (watch it here).
Detoxification
