Transcript Connect!

Connect!
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Make a quick sketch of the Earth as a ball.
Add satellite dish, and radio towers, electric/phone
poles, phone towers… any structure that sends
or receives information.
Why do these structures stick up from the
surface of the Earth?
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Sketch a diagram of the structure of the cell membrane.
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Add to the diagram to indicate how cells could send/receive info.
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What are the structures called that receive info?
Recognizing Signals
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cells are able to receive messages
due to the cell membrane which has
special receptor molecules
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these receptors have
specific shapes which
correspond to chemicals
such as hormones that
send messages to target
cells
Cells not meant to receive
a specific message simply
do not have the
corresponding receptor in
their cell membranes
Cell Receptors
Surface carbohydrates on cells serve as points of
attachment for other cells, infectious bacteria or
viruses, toxins, hormones, and many other
molecules.
Lymphocytes,
a type of
white blood
cell, recognize
foreign
invaders by
using
receptors.
Hormones
influence
target cells
by binding
to receptors,
which then
influence
the nucleus
to direct cell
activities in
a certain
way.
HORMONE
TARGET CELL
MEMBRANE
MESSAGE
NUCLEUS
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For example, the hormone FSH is
sent from the brain all over the
body of a woman through the blood.
Only the cells with the correct
receptors (in this case the cells of
the ovaries) receive this message to
mature eggs.
Ovary
cell
Pancreas
cell
Stomach
cell
Brain
cell
Chunk!
How do cells receive messages?
 How do the receptors work?
 What is a “target” cell?
 Name some things that cells have
receptors for.
 How do hormones work?
 Give a specific example of a hormone
and its target cell.
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Images
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Cell membrane - http://library.thinkquest.org/C004535/media/cell_membrane.gif
Receptor - http://www.unisa.edu.au/iwri/futurestudents/phdprojects/interf4.jpg
Virus and lymphocyte - student.ccbcmd.edu/.../gensteps/u3fg2g.html
Rest of images are self-generated