What Is Mass Flow A Level Biology?

Mass flow, also known as “mass transfer” and “bulk flow”, is the movement of fluids down a pressure or temperature gradient, particularly in the life sciences. As such, mass flow is a subject of study in both fluid dynamics and biology.

What is mass flow theory?

The pressure flow hypothesis, also known as the mass flow hypothesis, is the best-supported theory to explain the movement of sap through the phloem. … This creates turgor pressure, also known as hydrostatic pressure, in the phloem. Movement of phloem sap occurs by bulk flow (mass flow) from sugar sources to sugar sinks.

What is mass or bulk flow system?
Mass flow or bulk flow is the movement down a pressure gradient ( a pressure gradient in plants is observed due to variations in solute concentration) or temperature gradient of substances in bulk or in masses. Xylem and phloem in plants play a similar role as veins and arteries in animals.

Why does mass flow occur?

mass flow (pressure flow) A hypothesis to explain the movement of sugars in the phloem tissue of plants. The pressure of water in the tubes (the hydrostatic pressure) causes it to move along the tubes to a sink (site of utilization), where the reverse process occurs. …

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What is mass flow in humans?

Mass flow systems work together with the specialised exchange systems (such as lungs). … In humans the right side of the heart pumps blood to the lungs only and is called the pulmonary circulation, while the left side of the heart pumps blood to the rest of the body – the systemic circulation.

What is bulk flow in blood?

Bulk flow is a process used by small lipid-insoluble proteins to cross the capillary wall. Capillary structure plays a large role in the rate of bulk flow, with continuous capillaries limiting flow and discontinuous capillaries facilitating the greatest amount of flow. You may also read,

Does mass flow require energy?

Nutrient Iron
Mass Flow X
Diffusion X
Root Interception X

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What is difference between bulk flow and mass flow?

Often known as a bulk flow that is a bulk movement of particles of matter in a defined form of flow. … Mass flow or bulk flow is the movement down a pressure gradient ( a pressure gradient in plants is observed due to variations in solute concentration) or temperature gradient of substances in bulk or in masses.

How does mass flow occur?

The narrowness of the tubes and the existence of plates help to produce pressure differences between different areas of the phloem and to stimulate a vast movement of materials from one place to another. This is known as mass flow. The sucrose produced in the leaf cells is actively transported into the phloem cells. Read:

Is osmosis a bulk flow?

Thus Stein’s view of osmosis as primarily a bulk flow must be extended to include old-fashioned diffusion, the simplest – and perhaps in biological membranes the predomi- nant – mechanism of osmosis.

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Is bulk flow passive or active?

Since bulk flow transports particles across a plasma membrane using energy, it is thought to be a type of active transport.

What is fuel mass flow?

The fuel mass flow rate is related to the total engine air flow rate mdot a by the fuel to air ratio f. The energy equation for the burner can be solved for the temperature ratio across the burner: Tt4 / Tt3 = (1 + f * nb * Q / (cp * Tt3)) / (1 + f)

How do you calculate mass flow rate?

Mass flow rate can be calculated by multiplying the volume flow rate by the mass density of the fluid, ρ. The volume flow rate is calculated by multiplying the flow velocity of the mass elements, v, by the cross-sectional vector area, A.

What happens during bulk flow?

This movement, often referred to as bulk flow, involves two pressure-driven mechanisms: Volumes of fluid move from an area of higher pressure in a capillary bed to an area of lower pressure in the tissues via filtration.

What is the largest artery in the body?

The aorta is the large artery that carries oxygen-rich blood from the left ventricle of the heart to other parts of the body.