Question

STUDY QUESTIONS
1. Describe briefly the transport of substances across
the cell membranes.​

Answer 1

$\huge\mathfrak{Answer:-}$

⭕️ Diffusion:- Movement by diffusion is passive i.e no ATP is consumed during this process.

• It may be from one part of the cell to the other,or from cell to cell, or over short distances.
• Substances move from regions of higher concentration to regions of lower concentration.

⭕️ Facilitated diffusion:- In facilitated diffusion, special proteins help move the substances across the membranes without expenditure of ATP.

• It is basically downhill transport.
• Saturation effect is seen here.
• A concentration gradient is already present.

⭕️ Active transport:- Energy is utilised in this process.

• Pumps are the proteins that uses energy to carry substances from low concentration to high concentration.
• It is uphill transport.

$\huge\mathfrak{Thank you:)}$

Answer 2

Answer:

Diffusion through a permeable membrane moves a substance from an area of high concentration (extracellular fluid, in this case) down its concentration gradient (into the cytoplasm). The passive forms of transport, diffusion and osmosis, move materials of small molecular weight across membranes.

hope this helps you!

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