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Yes, the plasma membrane is more permeable to K+ than Na+ during rest because of the presence of leak channels that are more selective for K+ ions. This creates a resting membrane potential where K+ plays a more significant role in establishing the internal negative charge of the cell.
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What part of the cell allows for substance to go in and out of it?
The cell membrane controls the movement of substances in and out of the cell. It is selectively permeable, allowing certain molecules to pass through while blocking others. This regulation helps maintain internal conditions necessary for the cell to function properly.
What is a membrane that allows some substances to pass through but excludes others?
A selectively permeable membrane allows only certain molecules or ions to pass through while blocking others based on size, charge, or other specific properties. This allows for regulation of what enters and exits a cell or organelle.
When a cell grows its plasma membrane expands does it involve exocytosis or endocytosis please explain?
When a cell grows and its plasma membrane expands, it involves more exocytosis than endocytosis. Exocytosis is the process where materials are moved from inside the cell to the cell's surface, contributing to the expansion of the plasma membrane during cell growth. Endocytosis involves the uptake of materials into the cell and may contribute to membrane recycling.
What is a cell's barrier between the inside and its environment?
The cell membrane, also known as the plasma membrane, serves as a barrier between a cell's interior and its external environment. It is selectively permeable, allowing certain molecules to pass through while keeping others out, thus regulating the movement of substances in and out of the cell.
What is selectively permeable?
The property of a membrane or other material that allows some substances to pass through it more easily than others.Selective permeability refers to the control that a cell membrane has in terms of what it allows to cross it. This gives the cell membrane the ability to choose which molecules enter or leave.
Why is The plasma membrane is much more permeable to K than to Na?
Even when both those atoms are encapsulated with water, potassium is smaller than sodium.
What part of the cell allows for substance to go in and out of it?
The cell membrane controls the movement of substances in and out of the cell. It is selectively permeable, allowing certain molecules to pass through while blocking others. This regulation helps maintain internal conditions necessary for the cell to function properly.
Why is the plasma membrane more permeable to potassium ions than sodium ions?
The plasma membrane is more permeable to potassium ions because it has more potassium ion channels compared to sodium ion channels. Additionally, potassium ions are smaller than sodium ions, which allows them to pass more easily through the membrane. The selective permeability of the membrane to potassium ions helps establish the resting membrane potential in cells.
Do eukaryotic plasma membranes contain cholesterol which makes the membrane more stable?
Yes, eukaryotic plasma membranes contain cholesterol, which helps maintain membrane fluidity and stability. Cholesterol reduces the mobility of phospholipid molecules, making the membrane less permeable to small water-soluble molecules and more resistant to changes in temperature.
What effect will more cholesterol in the plasma membrane have on the membrane?
It will cause it to become rigid
What is a membrane that allows some substances to pass through but excludes others?
A selectively permeable membrane allows only certain molecules or ions to pass through while blocking others based on size, charge, or other specific properties. This allows for regulation of what enters and exits a cell or organelle.
When a nerve is activated by a threshold stimulus the membrane becomes more permeable to?
Potassium and Sodium
When is a neurolemma more permeable to potassium than sodium?
The neurolemma is more permeable to potassium than sodium during the resting state of a neuron, known as the resting membrane potential. This is due to the presence of leak potassium channels that allow potassium ions to move more freely across the neurolemma, contributing to the negative charge inside the neuron.
Are Excitable cells like neurons are more permeable to sodium than to potassium?
Yes, excitable cells like neurons are more permeable to sodium ions than potassium ions. This selective permeability is due to the presence of more sodium channels compared to potassium channels in the cell membrane, allowing sodium to flow into the cell more readily during an action potential.
Two liquids are sepertated by a membrane that is not permeable one liquid has a high concentration of salt the other liquid is plain water you can expect?
If the membrane is not permeable to either sodium and chloride ions or water then the concentrations of the liquids would remain the same. However, if the membrane was permeable to water or the ions then the plain water would become more salty while the salty water would become more dilute (due diffusion/osmosis, depending on the membrane's permeability).
Explain what effect more cholesterol in the plasma membrane will have on the membrane?
Increasing cholesterol in the plasma membrane can make the membrane more rigid and less fluid. This can affect membrane permeability and the function of membrane proteins. Additionally, high levels of cholesterol can lead to the formation of lipid rafts, which can impact cell signaling pathways.
What effect more cholesterol in the plasma membrane will have on the membran?
It will cause it to become rigid
