Dissolved Substances Flashcards

1
Q

Dissolved substances move by what two methods

A

Diffusion

Active transport

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2
Q

How does water move across boundaries

Explain this method

A

Osmosis is the diffusion of water from a low to high concentration through partially permeable membranes

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3
Q

What can a difference in concentration do both inside and outside a cell

A

Water to move in or out of a cell through osmosis

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4
Q

What do most soft drinks contain

3 things

A

Water
Sugar
Ions

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5
Q

What happens if water and ions are not replaced in a body

A

Ion/water balance is disturbed and the cells do not work as efficiently

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6
Q

What is the process at which substances move against a concentration gradient

A

Active transport which requires energy from respiration

Enables cells to absorb ions from dilute areas

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7
Q

How is gas exchange increased in humans

A

SA increased by alveoli

SA of small intestines increased by villi

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8
Q

What is the function of villi in the small intestines

A

Large surface area as folded membrane

Has an extensive network of capillaries to a sieve the products of digestion

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9
Q

What two gas exchange processes does the villi do

A

Diffusion

Active transport

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