Summary
Summary Cell physiology
- Course
- Institution
Summary of my as1 notes
[Show more]
Seller
Followjamielyons1
Content preview
CellphysidogymmmmnMovement of substances across membrane : f f f f f f f f
1. Simple diffusion 4. Osmosis
simple diffusion high
Facilitated diffusion Endocytosis CYTOSIS ( bulk transport)
2. 5. .
11 11 11 11 11 11
Active transport Passive process
3. 6.
Exocytosis
which does not 111111111111
Dniffmusienmdinmmpded .
require AIP low
the movement of particles down a concentration gradient from a
region of very small molecules such as oxygen water ,
high concentration to low concentration can pass directly unaided by simple diffusion
a
region of .
.
actotum
concentration gradient greater -
the concentration membrane thickness biological membranes usually
gradient ,
the faster the rate of diffusion .
thin ideal for rapid diffusion .
Size of molecule -
small molecules diffuse faster .
Surface area
greater the surface area the
temperature quicker at higher temps -
due to faster the rate of diffusion .
Some are
highly folded
more kinetic energy . into microvilli were diffusion is important .
ions pass Channel
Eaneitifafiemdmdmiffusionmm Via a channel
protein :
through closed open
ions
Type of diffusion that formed by proteins and central
✗
carriers
requires or
" " " " " " " " I " " " " •
§
channels to transport molecules
pores which enable ions to pass
•
. . →
§
always open nonselective
°
down the concentration
gradient without ATP . Some are .
11111111 111111 11111111
Used for transport of polar charged others have select
gate and
ion
,
a ions
channel
protein
diffused
which ions
unable to pass between
go through
molecules that
" "
i.iii.
are .
phospholipid molecules and is also passive .
Via a
protein
carrier :
diffusing
The rate take
of facilitated diffusion is These
large polar diffusing molecules carrier protein
.
dependant on the number of channel molecules ie
glucoseinto a receptor 11111111
:
•
3
site They the
and carrier proteins the
change shape before release
•
in .
-
membrane .
Very selective . *
carrier
protein
Activetransportmmmm
This mode of transport moves specific receptor site that is f f f f f f f f
complementary to only
carrier protein
molecules
against the concentration one
type of Low conc
grdient using ATP molecule , therefore
very selective .
" " " " " " " " " " " " " " " "
0
specific carrier proteins called pumps The abundance of carriers is decided villi ruin ruin
0
villi
substance to be carried must bind to by the amount of each different substance ^
receptor site in the carrier protein . Due to requirement of ATP cells ATP
ADP + Pi
that carry out will have Hioshconc
carrier will then
change shape many
the mitochondria
releasing transported molecule . .
with / concentration Way of movement Types of molecules
Passive Active process against Factors affecting movement
or
gradient transported
.
Simple Very small conc
gradient ,
size, temp
diffusion Passive With directly e.g Oz coz , membrane thickness surface ,
area .
Facilitated Use protein Polar charged,
Abundance of each
diffusion Passive With carrier -1 channel hydrophilic carrier and channel protein
Proteins
Active Use protein each side has Abundance of each
transport Active against carrier only specific ey glucose carrier
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller jamielyons1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.98. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83750 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now