ජීවයේ විද්යුත් පදනම 1
මම මේක දැනට ඉංග්රීසියෙන් දාන්නම්...මොකද සිංහලෙන් ටයිප් කරන්න ගියොත් මට මේක කරන්න කල් යන නිසා....මම මේක විශේෂයෙන් දන්නේ විශාල ආගමික බොල්, හරසුන් සාකච්ජා ගණනාවක් මේ එළකිරියේ මේ විෂය සම්බධයෙන් මේ වන විට යන නිසා....
Life on Earth began in the oceans, and even before life began, the ocean was much more than just water. Ocean water is a solution of dissolved salts, minerals, and particles in suspension. Although water has been called the “universal solvent,” some organic molecules such as oils and fats, known as lipids, do not dissolve in water. Sheets of lipid may come together to form membranes that can separate one compartment of water from the rest of a larger body of solution. Such sheets of lipid form an essential element of the membranes of living cells. However, it is the incorporation of proteins into the lipid membrane that defines a cell as a living thing. Proteins, both in the membrane and inside the cell, serve the function of making what is inside alive, different from the water-based solution that is outside the cell and not alive. Some proteins in cell membranes are selective about what they bring into the cell or extrude into the surrounding water. Proteins inside of cells can draw energy from “foods” brought through the membrane with the process of metabolism. Proteins in the membrane called “pumps” use the energy from metabolism to move electrical charge by controlling the movement of charged particles in
and out of the cell. Other proteins, called “channels,” are selective about what they let pass through the membrane passively.
The same principles hold for a single cell traveling through the blood stream of a human being as for a single cell in a vast ocean of water. A human body is approximately 60% water, and of that, two thirds is inside of cells, while the remainder is in blood and the spaces between cells.
It was not until after scientists began to appreciate that living cells used electrical energy that it was discovered that there are different distributions of the charged particles (ions) inside of cells and outside of cells. The cell membrane ion pumps typically push sodium ions out of cells and draw potassium ions into the cells. For every three sodium ions they push out, they draw only two potassium ions in. As a result of this imbalanced transport, a negative electrical charge builds up on the
inside of the cell’s membrane. It is this energy that can move through a body from a spinal cord to a leg muscle and make the muscle move. It is this energy, stored inside the membranes of cells in the nervous system, that makes possible all that the human brain and body can do.
කෙනෙක් මේ සම්බන්ධව යහපත් ප්රතිචාරයක් දැක්කුවොත් ... මම මේක සිංහලෙන් දාන්නම්
මම මේක දැනට ඉංග්රීසියෙන් දාන්නම්...මොකද සිංහලෙන් ටයිප් කරන්න ගියොත් මට මේක කරන්න කල් යන නිසා....මම මේක විශේෂයෙන් දන්නේ විශාල ආගමික බොල්, හරසුන් සාකච්ජා ගණනාවක් මේ එළකිරියේ මේ විෂය සම්බධයෙන් මේ වන විට යන නිසා....
Life on Earth began in the oceans, and even before life began, the ocean was much more than just water. Ocean water is a solution of dissolved salts, minerals, and particles in suspension. Although water has been called the “universal solvent,” some organic molecules such as oils and fats, known as lipids, do not dissolve in water. Sheets of lipid may come together to form membranes that can separate one compartment of water from the rest of a larger body of solution. Such sheets of lipid form an essential element of the membranes of living cells. However, it is the incorporation of proteins into the lipid membrane that defines a cell as a living thing. Proteins, both in the membrane and inside the cell, serve the function of making what is inside alive, different from the water-based solution that is outside the cell and not alive. Some proteins in cell membranes are selective about what they bring into the cell or extrude into the surrounding water. Proteins inside of cells can draw energy from “foods” brought through the membrane with the process of metabolism. Proteins in the membrane called “pumps” use the energy from metabolism to move electrical charge by controlling the movement of charged particles in
and out of the cell. Other proteins, called “channels,” are selective about what they let pass through the membrane passively.
The same principles hold for a single cell traveling through the blood stream of a human being as for a single cell in a vast ocean of water. A human body is approximately 60% water, and of that, two thirds is inside of cells, while the remainder is in blood and the spaces between cells.
It was not until after scientists began to appreciate that living cells used electrical energy that it was discovered that there are different distributions of the charged particles (ions) inside of cells and outside of cells. The cell membrane ion pumps typically push sodium ions out of cells and draw potassium ions into the cells. For every three sodium ions they push out, they draw only two potassium ions in. As a result of this imbalanced transport, a negative electrical charge builds up on the
inside of the cell’s membrane. It is this energy that can move through a body from a spinal cord to a leg muscle and make the muscle move. It is this energy, stored inside the membranes of cells in the nervous system, that makes possible all that the human brain and body can do.
කෙනෙක් මේ සම්බන්ධව යහපත් ප්රතිචාරයක් දැක්කුවොත් ... මම මේක සිංහලෙන් දාන්නම්
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