Explanation

• Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration due to their random motion.
• Diffusion is a passive process, meaning it does not require cellular energy (ATP).

Additional information:

• Osmosis is the movement of water through a selectively permeable membrane from a region of higher water potential to lower water potential.

Last verified on 28-10-2026

Explanation

• The secondary cell wall develops between the plasma membrane and the primary cell wall after the cell has stopped or largely completed its expansion.
• It is deposited on the inner side of the primary cell wall.
• It often contains cellulose, hemicellulose, and lignin.
• Lignin makes the secondary cell wall stronger and more rigid, providing mechanical support to the plant.

Last verified on 28-10-2026

Explanation

• Nephrolithiasis is the medical term for the formation or presence of stones in the kidneys.
• These stones are also called renal calculi.
• Kidney stones commonly form when minerals and salts, such as calcium oxalate, crystallize in the urine.

Last verified on 28-10-2026

Explanation

• The human kidney contains approximately 12–16 renal pyramids.
• Renal pyramids are cone-shaped structures located in the renal medulla, the inner region of the kidney.
• They contain tubules and collecting ducts that help transport urine toward the renal papillae and minor calyces.

Last verified on 28-10-2026

Explanation

• The nucleolus is a dense region inside the nucleus where ribosomal RNA (rRNA) is produced and ribosomal subunits are assembled.
• Ribosomes are responsible for protein synthesis in the cell.

Last verified on 27-10-2026