NEET BIOLOGY

Detailed explanation-1: -Gases like carbon dioxide and oxygen can move across the cell membrane via diffusion. Diffusion is the movement of gas molecules from a region of higher concentration, to a region of lower concentration through a semi-permeable membrane.

Detailed explanation-2: -H2O moves in and out of the cell by osmosis which is a form of diffusion. In osmosis, the water molecules move from lower solute concentration to higher solute concentration through the cell membrane. i, e. the water molecules move from the region of their higher concentration to lower concentration.

Detailed explanation-3: -1.2 Osmosis Osmosis is a special type of diffusion, namely the diffusion of water across a semipermeable membrane. Water readily crosses a membrane down its potential gradient from high to low potential (Fig. 19.3) [4].

Detailed explanation-4: -Oxygen diffuses through the cell membrane and is transported in blood plasma by free diffusion and by convection.

Detailed explanation-5: -The walls of the alveoli share a membrane with the capillaries. That’s how close they are. This lets oxygen and carbon dioxide diffuse, or move freely, between the respiratory system and the bloodstream. Oxygen molecules attach to red blood cells, which travel back to the heart.