Question

The cell membrane is considered semi because it only allows certain compounds to travel through freely.The random movement of molecules down their concentration gradient is called: Moving down a concentration gradient means moving from a to a concentration.

Answer 1

Answer:

The cell membrane is considered semi-permeable because it only allows certain compounds to travel through freely.  

The random movement of molecules down their concentration gradient is called: diffusion  

Moving down a concentration gradient means moving from a higher ------ to a--lower------ concentration.  

Some compounds need to travel into the cell through a membrane protein, this is an example of ----facilitated transport-  

When compounds are pumped against their concentration gradient they are being moved from ---lower---to higher-------by this type of transport: -Active transport--------  

The majority of the cell membrane is composed of what type of lipids? Phospholipid------

Semi-permeable or selectively permeable membrane refers to the activity of phospholipd bilayer of the cells membranes with the outer hydrophilic head  which allow passage of polar molecules, and the inner hydrophobic ends which   restrict the movement of polar  substances , but allows non- polar molecules across it. The advantage is that  movements of substances across the walls of the cells membrane is well regulated.

Diffusion is the  movement of  ions, molecules due to differences in concentration gradient from a region of high concentration to region of lower concentration.Its  principle is based on Fick's Law.;Its rate depends on the surface area exposed, the degree of concentration, but slow down as the separating distance increases.

Due to  unequal distribution of molecules or ions, differences in concentration gradient  occurs Molecules tends to  move away  to a less crowded medium with their average kinetic energy,.The movements to a less crowded medium creates  concentration gradients,  between the original and the new medium.

Some molecules and compound that could not cross the membrane channels due to differences in size and polarity do so with the help of certain transport proteins. which aids their movement across. These protein may cut across the entire length of the membrane , to ferry molecules and compounds across. Because they aided or facilitated the movements across , the membrane the mode of transport is called facilitated transport .

The need to meet up with the cellular  requirements  and to avoid depletion  in metabolites;ensures the movement of substances  against their concentration gradients.This  transport requires energy as ATPs, because substances are moving  up-hill, thus energy is required for access to already saturated medium.

The phospholipid bilayer ensures  passage of polar substances across the cell membrane. This makes the cell membrane to have   different permeability    to the movement of  different substances, of the surrounding medium

Answer 2

Because it only allows specific substances to pass through freely, the cell membrane is referred to as selectively permeable or semipermeable.

Selectively permeable or semipermeable.

Diffusion is the random movement of molecules along a concentration gradient.

When you move down a concentration gradient, you're going from a high concentration to a low concentration.

Some substances must pass through a membrane protein to enter the cell, this is an example of assisted diffusion.

Find out more information about 'Semipermeable'.

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