AP BIOLOGY

Detailed explanation-1: -Since there is no energy required in this movement of particles, it is termed as a passive transport. Movement of oxygen across the cell membrane is an example of diffusion as the concentration of oxygen is greater outside the cell than the inside.

Detailed explanation-2: -Oxygen diffuses through the cell membrane and is transported in blood plasma by free diffusion and by convection.

Detailed explanation-3: -Following are some examples of passive transport: Ethanol enters our bodies and hits the bloodstream. This happens because the ethanol molecules undergo simple diffusion and pass through the cell membrane without any external energy.

Detailed explanation-4: -Oxygen is diffusing from the air inside the alveoli within the lungs into the erythrocytes and blood plasma. Diffusion is a type of passive transport, where molecules move from high concentration to low concentration. This means that the concentration of oxygen in the air must be higher than it is in the blood.

Detailed explanation-5: -5. Is diffusion active or passive? Diffusion is a type of passive transport that does not require energy. Diffusion helps the molecules to move from a region of high concentration to a region of low concentration.