Transcript “brains” of the cell, the nucleus directs cell activities and contains

Why does diffusion occur?
1
Kinetic energy causes
molecules to constantly move
and collide with each other.
2
What is the movement from
an area of high concentration
to an area of low
concentration?
3
Diffusion
4
Give the type of particle
transport that requires input
of energy from the cell.
5
Active Transport
6
What happens to cells placed
in a hypertonic solution?
7
They shrink due to losing
water by osmosis
8
Which parts will be near
water because they are
hydrophilic?
9
Part labeled A:Polar heads of
the phospholipids
10
Which parts will repel water
because they are
hydrophobic?
11
Part E: Non Polar Tails of
phospholipids
12
When the concentrations
across a cell membrane are
the same… Does Osmosis
occur?
13
No. Because the cell is at
equilibrium in a state of
homeostasis
14
Are cholesterol and
phospholipids hydrophobic or
hydrophilic?
15
Hydrophobic.
Both are repelled by water.
16
What is osmosis?
17
The diffusion of water
18
What happens to a cell that is
placed in a hypotonic
solution?
19
It swells up
20
What structure serves as the
cell’s boundary from its
environment
and regulates which materials
enter and leave the cell?
21
Cell Membrane
22
Large molecules such as
hormones are released or
expelled from a cell during?
23
Exocytosis
24
What happens if too much
water diffuses into a cell?
25
It may burst
26
What is an example of passive
transport?
27
Diffusion
28
What is passive transport?
29
Cell transport that requires no
energy from the cell
30
What is the movement of
molecules down a
concentration gradient across
the cell membrane?
31
Diffusion
32
What is the difference in the
concentration of dissolved
particles from one location to
another is called?
33
Concentration Gradient
34