Respuesta :
Explanation:
This is because the sodium ions are charged particles as opposed the the neutral uncharged glucose molecules. The cell membrane is selectively permeable. Which means that it only allows certain types of particles to move through its membrane. This is because the phospholipid bi-layer in the cell membrane restricts the movement of charged particles through them as their tails are hydrophobic (water hating). This restricts charged particles from moving through them but uncharged particles like glucose are unhindered.
Glucose, a small uncharged molecule, can pass through the cell membrane, but sodium ions do not pass through the membrane easily. This can accurately be explain by the semi-permeability of the cell membrane.
Cell membrane allows selective movement of materials in and out of the cell. It allows some substances to pass through the membrane while others will not.
Further Explanation
- A cell membrane is an organelle whose role is to protect the cell from the outer environment. The membrane contains phospholipid bi-layer and proteins that are embedded in the bi-layer.
- Cell membranes contain receptors and channels that only allow specific molecules to pass through the cell membrane.
Selective permeability
- Selective permeability is one of the properties of cell membranes, such that the cell membrane only allow certain materials to pass through while others cannot.
- Movement of substances across the cell membrane may either be passive or active.
- Passive transport of molecules across cell membranes occurs without energy input while active transport of substances occurs with energy input in the form of ATP.
Examples of materials than can diffuse freely through the cell membrane
- Small uncharged molecules
- Small non polar molecules such as CO2 and O2
- Small uncharged polar molecules such as H2O
Examples of materials that cannot diffuse freely through the membrane.
- Larger uncharged polar molecules such as glucose
- Small and larger charged molecules such as ions cannot diffuse freely through the membrane.
However, ions and most polar molecules such as glucose that cannot diffuse through the cell membrane freely, can pass across the membrane through transporters such as trans-membrane proteins.
Keywords: Selective permeability, transport, cell membrane
Learn more about:
- Selective permeability: https://brainly.com/question/1220097
- Active and passive transport: https://brainly.com/question/1220097
- Cellular transport: https://brainly.com/question/1220097
Level: High school
Subject: Biology
Topic: Cellular transport and physiological processes
Sub-topic: Role of cell membrane in transport
