Why plasma membrane called semi permiable?

Question

Answer

Plasma membrane is called semi permeable because it allows only certain substances to pass through it. It doesn't allow any harmful bacteria. It only allows the nutrients, oxygen and other useful substances for our body.

Answer

It is called selectively permeable membrane because it allows entry and exit and it allows selected material to come

Answer

Plasma membrane is known as semi  permeable membrane because it allows only some material to enter and exit from the cell

Answer

Why is the plasma membrane called semi-permeable?
The plasma membrane is often referred to as semi-permeable because it selectively allows certain substances to pass through while restricting the passage of others. This characteristic is crucial for maintaining cellular homeostasis and proper functioning.

Key points:

The plasma membrane is composed of a phospholipid bilayer with embedded proteins that control the movement of molecules in and out of the cell.
Small, non-polar molecules such as oxygen and carbon dioxide can freely diffuse across the membrane due to their hydrophobic nature.
Water molecules can also pass through the membrane via a process known as osmosis, facilitated by aquaporin channels.
Larger or charged molecules, such as ions and glucose, require specific transport proteins to facilitate their transport across the membrane.
This selective permeability is essential for regulating the internal environment of the cell and ensuring that essential nutrients are taken in while waste products are expelled.
By controlling the passage of substances, the plasma membrane helps maintain the balance of ions and molecules inside the cell, allowing it to function properly.
In summary, the semi-permeable nature of the plasma membrane allows for the controlled movement of substances in and out of the cell, ensuring its survival and functionality.

Overall, the semi-permeable nature of the plasma membrane is crucial for cellular health and function, as it allows for the selective transport of substances essential for cell survival while preventing the entry of harmful or unnecessary molecules.

Answer

Coz it allows only certain material to pass through them.

Similar Class 9 Doubts

Why is plasma membrane called a semi permeable membrane?

when plasma membrane is called semi permeable membrane?

Why plasma membrane is called selectively permeable membrane?

Why plasma membrane is called as selectively permeable membrane ?

why is the plasma membrane called a selectively permeable membrane?

Top Courses for Class 9View all

Science Class 9

Social Studies (SST) Class 9

Mathematics (Maths) Class 9

English Class 9

English Grammar Advanced

Top Courses for Class 9

Top Courses for Class 9

Suggested Free Tests

Related Content

Class 9 Study Material

Class 9 Subjects

Competitive Examinations for Class 9

NCERT Books

NCERT Solutions

Reference Books for Class 9

Other Popular Exams

Company