Transcript Aim #28 - Manhasset Schools

Date: November 19, 2015
Aim #28: How can we compare active and
passive transport?
Do Now: Warm-Up Notebook
Date
Title of Activity
11/19
The Cell Membrane
Page #
48
HW:
1) Handout- “Transport Review” due tomorrow
2) “Song of the Cell” due Monday
3) QUIZ- Tuesday/Wednesday (Aim #’s 24-26)
Aim #28:
How can we compare active and
passive transport?
Cell Transport
ABSORB
DISTRIBUTE
The Cell
Non-living cell
surroundings
Living
cell
Secrete chemicals (hormones,
neurotransmitters, enzymes,
antibodies…)
Secrete Metabolic wastes
(CO2, urea)
Take in: O2, end products of
digestion, minerals, chemical
messengers (hormones &
neurotransmitters)
Do all things get through the cell membrane?
What is
concentration?
Water
Molecules
SELECTIVELY PERMEABLE
Does this picture illustrate a concentration gradient?
Yes… there is
a higher
concentration
on the right
side than the
left
How does a rollercoaster work?
HIGH
LOW
LOW
When will he need energy?
Should I go
against the
gradient or down
the gradient
HIGH
LOW
LOW
http://programs.northlandcollege.edu/biology/Biology1111/animations/transport1.html
1) What are the two types of transport?
ACTIVE
TRANSPORT
PASSIVE
TRANSPORT
HIGH
LOW
LOW
2) What are characteristics of Active
Transport?
• Energy required
• Against concentration
gradient
• From low to high
LOW
HIGH
3) What are characteristics of Passive
Transport?
• No energy required
• Moves along/down
concentration gradient
• From high to low
HIGH
LOW
Can you tell the difference?
Would you need energy?
Yes…
it is going from
Low to High
Concentration
4) What are the three types of passive
transport?
What direction would the
a) Diffusion- movement of
O2 and CO2
materials move in?
4) What are the three types of passive
transport?
b) Facilitated Diffusiontransport proteins help move
materials from high to low
concentration
• Alcohols and glucose
4) What are the three types of passive
transport?
c) Osmosis- diffusion of water
5) What are some examples of Active
Transport?
a) Contractile vacuole- used
to pump out water from
freshwater organisms like
paramecium
5) What are some examples of Active
Transport?
b) Endocytosis- taking
materials into cells
i.
Phagocytosis- engulf large
particles
ii. Pinocytosis- pinch in small
amounts of liquids
iii. Receptor-mediated endocytosismolecules first bond with receptors
on cell membrane and then are
taken into cell vesicles.
Phagocytosis
Receptor-Mediated Endocytosis
5) What are some examples of Active
Transport?
c) Exocytosis- the removal of
materials from a cell
Comparing the two…
https://www.youtube.com/watch?v=DuDmvlbpjHQ
5) What are some examples of Active
Transport?
d) Sodium-Potassium Pump• 3 positive sodium ions (Na+) are pumped
out of the cell for +every 2 positive
potassium ions (K ) pumped into the cell.
• This means that there are more positive
charges leaving the cell than entering it.
• As a result, a positive charge builds up
outside the cell compared to inside the
cell.
• The difference in charge between the
outside and inside of the cell allows nerve
cells to generate electrical impulses which
lead to nerve impulses.
Active vs. Passive Transport
Energy
Required
Direction
Types
Active
Transport
Passive
Transport
YES
NO
LOWHIGH
Endocytosis,
Exocytosis, SodiumPotassium Pump
HIGHLOW
Diffusion, Facilitated
Diffusion, Osmosis
Cellular
Transport
Enegy Required
Low to High
No Energy Required
High to Low
Passiv e
Transport
Activ e
Transport
uses
transport
proteins
Dif f usion
take in materials
Facilitated
Dif f usion
let out materials
Endocy tosis
Exocy tosis
of water
pinch in
small amounts
of liquids
engulf
large
solds
Osmosis
Pinocy tosis
Phagocy tosis
What is this process called?
Base your answers to the next two
questions on the graph below and your
knowledge of biology. The graph shows the
relative concentrations of different ions
inside and outside of an animal cell.
1) Write the symbol of the ion that is
closest to equilibrium inside and
outside of the cell.
2) Name the process responsible for
maintaining high concentrations of
K+ inside the cell.