Osmosis active transport Flashcards

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1
Q

What is diffusion

A

The net movement of a substance from a high concentration to a low concentration this process does not require energy from respiration

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2
Q

What does oxygen go through to get into the cell

A

Cell membrane

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3
Q

What affects the speed of diffusion

A

temp
The size of molecule
A big difference in concentration
Distance

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4
Q

If perfume was sprayed at one end of the room how would it be smelt at the other use diffusion

A

When you first spray the perfume the smell will only be near the person that sprayed it gradually it spreads through the room hitting other particles changing directions eventually diffusion is complete

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5
Q

What does diffusion is a passive process mean

A

It takes place along a concentration gradient from high to low and uses up no energy

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6
Q

What are 3 examples of where diffusion takes place in a living organism

A

Oxygen diffuses into cells respiration
Glucose into a cell
Getting red of waste material

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7
Q

What do the alvioli do

A

They increase the surface area and helps increase the rate of diffusion

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8
Q

What does the villi do

A

Each cell increases there surface area by having villi and it absorbs the soluble products of digestion

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9
Q

Why is diffusion important

A

It is the main way in which living organisms obtain the things they need and get rid of their waste products

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10
Q

What is osmosis

A

It is the net movement of water from a high water concentration to a low water concentration across a partially permeable membrane

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11
Q

What only moves by osmosis

A

Water

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12
Q

Which way does water move in osmosis

A

From a high to a low concentration of water across a partially permeable membrane

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13
Q

What will happen to animal cells if they are placed in a solution of distilled water

A

If the cell is in distilled water then it will burst causing water to flood out it bursts because there is so much water going into it

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14
Q

What will happen to a plant cell in distilled water

A

It doesn’t burst instead it fills up and the cell wall goes tough this is called turgid

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15
Q

What does hypertonic mean

A

Having a higher osmotic pressure

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16
Q

If you have a cell with 10% sugar solution in it and saturated sugar solution around it would it expand or shrivel

A

This cell will shrivel because osmosis is movement from a high water concentration to a low water concentration

17
Q

What is a saturated solution

A

A solution that contains all the dissolved substances it can hold

18
Q

Visking tube is selectively permeable what does this mean

A

Only smaller molecules can cross the membrane

19
Q

How do you work out the percentage change

A

You take the change times 100

Original

20
Q

What is definition of active transport

A

Active transport is where molecules move from an area of low concentration to an area of high concentration against the concentration gradient it is a process that requires energy for the molecules to be carried across the membrane this energy is produced in cell respiration therefore cells that are involved in a lot of active transport usually have mitochondria

21
Q

What happens in only active transport

A

Requires energy
Against concentration gradient
How minerals get into root hair cells

22
Q

What happens in only osmosis

A

Only involves water

How water keeps plant cells turgid

23
Q

What happens in diffusion and osmosis

A

High concentration to a low concentration

24
Q

What happens in diffusion and active transport

A

Involves transport of solutes

25
Q

What happens in osmosis and active transport

A

Needs a semi permeable membrane

26
Q

What happens in osmosis diffusion and active transport

A

Movement of particles occur in nature

27
Q

What happens in only diffusion

A

How oxygen leaves a leaf

28
Q

Where does active transport take place in humans

A

Small intestine to absorb glucose from digestive food

29
Q

How does surface are affect the rate of diffusion

A

The higher the surface are the faster