1.1.1 - The Need For A Circulatory System Flashcards

1
Q

What Do The Cells Of All Living Organisms Need A Constant Supply Of?

A

Reactants for metabolism. E.g. Glucose and oxygen.

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2
Q

How Do Single Celled Organisms Gain Oxygen & Glucose?

A

Directly from their surroundings and the molecules can diffuse to all parts of the cell quickly due to a short diffusion distance.

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3
Q

How Do Larger (Multicellular) Organisms Gain Oxygen & Glucose?
(4 Points)

A

~ They are made up of many layers of cells.

~ The time taken for substances to diffuse to every cell in the body would be too long.

~ Larger organisms have higher diffusion distances and energy requirements, this means the delivery of reactants for metabolism needs to happen quickly.

~ To solve this problem their exchange surfaces are connected to a mass transport system.

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4
Q

Describe Mass Transport Systems
(2 Points)

A

~ Used to carry raw materials from specialised exchange organs to the body cells and to remove metabolic waste.

~ E.g. Circulatory system.

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5
Q

What Do Mass Transport Systems Help To Do?
(3 Points)

A

~ Bring substances quickly from one exchange site to another.

~ Maintain diffusion gradients at exchange sites, between cells and their fluid surroundings.

~ Ensure effective cell activity by supplying reactants and removing waste products.

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