Table of Contents
- 1 What types of substances can pass through easily?
- 2 What term means that some things may pass through but not others?
- 3 What is considered selectively permeable because it allows some substances to cross more easily than others?
- 4 What type of materials easily pass through the cell membrane?
- 5 What must materials pass through to enter or leave a cell?
- 6 How does the permeability of a material change?
- 7 Why is a ferrous material attracted to a permanent magnet?
- 8 What kind of material can pass through the lipid core?
What types of substances can pass through easily?
Because the cell membrane is semipermeable, only small, uncharged substances like carbon dioxide and oxygen can easily diffuse across it. Charged ions or large molecules require different kinds of transport.
What term means that some things may pass through but not others?
selectively permeable
Introduction: Passive Transport In other words, plasma membranes are selectively permeable; they allow some substances to pass through, but not others.
Why would a cell allow some substances to pass through it but not others?
The membrane is selectively permeable because substances do not cross it indiscriminately. Some molecules, such as hydrocarbons and oxygen can cross the membrane. Many large molecules (such as glucose and other sugars) cannot. Others actually bind to the molecules and move them across the membrane.
What is considered selectively permeable because it allows some substances to cross more easily than others?
The cell membrane is selectively permeable. Selective Permeability. A property of biological membranes that allows some substances to cross more easily than others. The cell membrane is selectively permeable.
What type of materials easily pass through the cell membrane?
Small hydrophobic molecules and gases like oxygen and carbon dioxide cross membranes rapidly. Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly.
What type of materials pass through the cell membrane?
Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.
What must materials pass through to enter or leave a cell?
Materials must pass through the cell membrane to enter or leave the cell. The cell membrane, also called the plasma membrane, is a phospholipid…
How does the permeability of a material change?
The Flux Lines do not “bend” in the wood and pass through as if it is not there. There is no Field to Field interaction and no attraction. The permeability of a material is not constant, and for a given temperature, it changes based on the intensity of the applied external magnetic field (H).
How are materials transported through the plasma membrane?
Materials move within the cell’s cytosol by diffusion, and certain materials move through the plasma membrane by diffusion (Figure 3). Diffusion expends no energy. On the contrary, concentration gradients are a form of potential energy, dissipated as the gradient is eliminated. Figure 3.
Why is a ferrous material attracted to a permanent magnet?
A ferrous material is attracted to a permanent magnet because the permanent magnet induces magnetism within the ferrous material. The permanent magnet’s field and the newly induced field in the ferrous part interact and attract.
What kind of material can pass through the lipid core?
Lipid-soluble material with a low molecular weight can easily slip through the hydrophobic lipid core of the membrane. Substances such as the fat-soluble vitamins A, D, E, and K readily pass through the plasma membranes in the digestive tract and other tissues.