Monday, February 7, 2011

How do cells communicate?

How do cells communicate?   
There are up to 4 ways cells can communicate.

What are the 4 ways of communication and how does it happen?
1) Direct Contact
Cells can contact directly between a cell and an extracellular matrix.

What is the extracellular matrix?
It is a layer of protein between a nerve and a muscle.

2) Short range signals
The cells secrete a protein to communicate over a short distance and the other cell receives, recognizes and intereperets the secretes.

3) Long range signals
This method usually involves hormones. Hormones play a part in long-range cell communication. They play an active role in the development of a person during different stages of puberty. Hormones such as insulin control the metabolism of sugar in the body.
4) Through complex messages
This method is sent out in the form of electrical and chemical signals. These messages are usually between two neurons (are basic building blocks of the nervous system) or between a neuron and a muscle cell. The points at which electrical signals are converted into chemical signals and then back into electrical signals are called synapses which occurs in the brain.

Why is it important to know how cells communicate?
It is important as it is applied in our daily lives as cells depend on each other in multi-cellular organisms. They need communicate so that they know if they reproduction or growth needs to take place.They help our whole body stay alive and It does that by letting the body signal to the organ, so that a specific item or job can be carried to that organ so that its function can take place. 

Example of Cells Communication Video

Reflection.

My Science Journal
Name: Jolene Lim  (23)         Date: 08/02/2011            Class: 3B3
Topic: Cells

3 main concepts I have learnt. You may list more. You are encouraged to use mutlti-media to enhance the post.

·         How to differentiate the smooth endoplasmic reticulum and the rough endoplasmic reticulum.

·         Difference between the nucleus and nucleolus.


·         Ribosomes are found in the endoplasmic reticulum and they make proteins from amino acids.
Identify 3 links this topic/concept has with something I have learnt before (can extend beyond Science)

  • Learnt about chromosomes only in the past but now, we learnt about chromatin. The two are similar but chromosomes are twisted, curled and coiled while chromatin is not.

  • Learnt only about the nucleus in the past but now we learn about the nuclear pores, which are pores that allow exchange of materials between the nucleus and the cytoplasm.

  • Mitochondrion supplies most of the cell’s chemical energy.





2 things/(questions) I am unsure about/(have). You may list more.

(a)   Not that clear about what the secretion vesticles are for.


(b)   Unclear about the function of the lyosome.



Where is this topic/concept applied in daily living? (Give at least 2)
  • Applied in daily life as cells are responsible for our growth, repairing and reproduction of new cells.
  • Transporting molecules throughout our body.







1 extended concept I am interested to research on /read more about:
-       How cells communicate.  
Common misconceptions(mistakes) OR scientific phrases that are important
(Give at least one)

  • Differentiating the smooth endoplasmic reticulum and rough endoplasmic reticulum.




What I am going to do to clarify my doubts? List the steps you are going to do and date you intend to complete them:

Concepts/Things I
am still unsure about
What I am going to?
Date I intend to get it done
Completed
(J when its done!)
(a)   Unclear about the function of the lyosome.


-       Read through again the notes my teachers gave, research online and ask the teacher if I am still unsure.

09/08/2011

(b) Not that clear about what the secretion vesticles are for.



-       Read through again the notes my teachers gave, research online and ask the teacher if I am still unsure or seek help from peers.

09/08/2011


My feelings and thoughts about class today: interesting as everything we learn about is related to our body.  And we get to see things we cannot see with the naked human eye.