Q:

What are types of passive transport?

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Quick Answer

There are four different types of passive transport: diffusion, facilitated diffusion, filtration and osmosis. Diffusion is the movement of substances from an area of high concentration to an area with lower concentration. The difference of concentration between these two areas is called concentration gradient.

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Full Answer

Diffusion is described as moving substances down the concentration gradient. This differs with active transport, which moves substances from a low concentration area to a higher one, a process referred to as moving substances against the concentration gradient.

Osmosis, on the other hand, is a type of diffusion whereby water molecules move through a cell membrane from a hypotonic solution to a hypertonic solution. A hypotonic solution is a solution with a low concentration of solutes, whereas a hypertonic solution has a high concentration of solutes.

Another passive process is filtration, which is the movement of solute molecules and water across the cell membrane by normal cardiovascular pressure. Certain functions of the kidneys and liver are based upon filtration. With facilitated diffusion, movement of molecules across the cell membrane occurs through carrier proteins, which are embedded in the cell membrane. The solutes in facilitated diffusion move down the concentration gradient and do not use energy to move.

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    How does temperature affect osmosis?

    A:

    The process of osmosis accelerates when the temperature rises just as it does with any process of general diffusion. While the process of diffusion is more random than that of osmosis, both processes rely on the movement of particles to attain equilibrium. As a general rule, particles move faster when they are at elevated temperatures, and they move slower when at reduced temperatures.

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    How does glucose enter a cell?

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    What is a form of passive transport that uses transport proteins?

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    Facilitated diffusion is a form of passive transport that utilizes transport proteins. These transport proteins are embedded within cell membranes, serving as figurative highways for molecules to get in and out of the cell.

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    What are the types of cellular transport?

    A:

    The main types of cellular transport are passive transport and active transport. Passive transport occurs spontaneously through diffusion, which is the movement of chemicals across the cell membrane from regions of higher concentrations to lower ones. Active transport requires energy and involves special proteins called pumps and transporter proteins.

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