An Infant in Respiratory Distress ...

A question for my students: 

 What is NICU? :))

Open Heart Surgery *Live*

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More

More

'Lub' 'Dub' 'Lub' 'Dub'

For those of you who want to learn more :))

Exciting Links for Transport in Humans!

HABITS OF THE HEART

CORONARY ARTERY BALLON ANGIOPLASTY

THE BLOOD TYPING GAME

I will have more soon, my dear students!!! =D

2012 June Holidays

My dearest students,


Here are the dates (during June Holidays) that we have previously agreed on:


For my Secondary 4s:
- 31st May, Thursday: 8am-930am, Lesson as scheduled
-1st June, Friday: 8am-930am, Lesson as scheduled
-4th June, Monday: 9am-1045am, MYE Re-Test Corrections (@NEXUS)
-2nd week of June - keep it free to complete Inheritance & Cell Division
-20th June, Wednesday: 9am-11am, Inheritance & Cell Division  


For my Secondary 3s:
-4th June, Monday: 9am-1030am, MYE Re-Test Corrections (@NEXUS)


For my Secondary 2s:
-30th May, Wednesday: 930am-1030am, MYE Re-Test Corrections
-31st May, Thursday: 930am-1030am, MYE Re-Test Corrections
-1st June, Friday: 930am-1030am, MYE Re-Test Corrections
-4th June, Monday: 930am-1030am, MYE Re-Test Corrections (@NEXUS)


Yours,
Mrs Lehming


Topics to study for Secondary 4 MYE Re-Test Corrections:
1) Cellular Structure & Organisation
2) Transport in Plants
3) Molecular Genetics
4) Sexual Reproduction in Plants
5) Sexual Reproduction in Humans
6) Respiration
7) Homeostasis (esp with regards to Diabetes mellitus)
8) Movement of Substances
9) Digestion
10) Excretion

From Conception to Birth 360 degrees!

Alexander Tsiaras: From Conception to Birth - Visualized

For my Sec 4s! Mitosis Music Videos

Preview for our next chapter coming up =)):

Nutrition in Humans

My dear students,


Here are some videos that might help you when you study about 1. chewing (mastication), 2. digestion, 3. absorption, 4. assimilation.






















A link to National Geographic's Digestive System website:http://science.nationalgeographic.com/science/health-and-human-body/human-body/digestive-system-article/

Molecular Genetics (The Basics)

A simplistic view of <The Central "Dogma" of Molecular Biology>:
A dogma is something that can never be changed. I put dogma in inverted commas because there is the existence of reverse transcriptase, with the ability to make cDNA (complementary DNA) from mRNA

My dear students,


Here are some videos to help you in understanding what exactly transcription is and what exactly translation is. 


Please note that for your syllabus, you do not need to know the whole transcription process. All you need to know is that mRNA is produced at the end of the transcription process and how you obtain this mRNA is through complementary base pairing with the template DNA strand.


However, you need to know the "simpler" translation process, how you obtain a polypeptide chain from an mRNA template. All the steps, I have listed down in the notes that I have already printed for you (and also uploaded as a .pdf onto AsknLearn). 


Thus, please use these videos to aid in your understanding, but do not stray away from what you really need to know at this point in time for your O levels. 


Yours truly,
Mrs Lehming


Transcription Videos












Translation Videos 

Sexual Reproduction in Humans

My dear Secondary 4s,


I found a link here (Endocrinology of the Menstrual Cycle), that shows the changes in hormonal levels illustrated clearly in a diagram, together with some explanations.


Although much of the readings are too difficult for you at this level, the diagram clearly illustrates what I was trying to draw in class today.


Another note, estradiol is a form of oestrogen. For your level, you only need to know about oestrogen, thus, you can think of estradiol as oestrogen.


The diagram I reproduce here before I log off:

Reproduced from: http://sprojects.mmi.mcgill.ca/menstrualcycle/physiology.html


Yours,
Mrs Lehming

Sexual Reproduction in Plants

An interesting link (lots of words though!):

Please click here: Smithsonian Education on Partners in Pollination

Movement of Substances

Here were some of the videos (and some additional ones) that I showed in class. If you want them to revise, here you go.


Diffusion





Osmosis





Don't know whether this works! Will try it one day!





Active Transport

A Virtual Cell

An interesting site: might help in your understanding of the chapter, Cellular Structure and Organisation. Click on the link and have fun!


Here is the link!

Yours,
Mrs Lehming

A Note

My dear students,


I must apologise for the lack of posts here of late. I have been really busy and my schedules have not permitted me to post regularly. 


From now on, however, I will post a little more regularly. :)) 


I have made up a time-slot in my schedule so that I can dedicate these few minutes into making lessons and topics more enjoyable and understandable for you. 


Bear with me, your human teacher, as you learn.


All the best with all your studies and remember always that asking questions (*whether you deem them silly or not) is always the first step in learning anything.


Yours,
Mrs Lehming

Ecology!

My Dear Ecologists,


Here are some videos that will help you to understand in greater detail what exactly Ecology is ... and all the other stuff we do in our lessons =) so here you go! 


(1) Ecology: An Introduction





(2) What is an Ecosystem?





(3) The Carbon Cycle





(4) The Carbon Cycle by NASA - Unnarrated: Follow the Text



Carbon is the basic building block of life, and these unique atoms are found everywhere on Earth. Carbon makes up Earth's plants and animals, and is also stored in the ocean, the atmosphere, and the crust of the planet. A carbon atom could spend millions of years moving through Earth in a complex cycle. This conceptual animation provides an illustration of the various parts of the Carbon cycle. Purple arrows indicate the uptake of Carbon; yellow arrows indicate the release of Carbon.

On land, plants remove carbon from the atmosphere through photosynthesis. Animals eat plants and either breath out the carbon, or it moves up the food chain. When plants and animals die and decay, they transfer carbon back to the soil. Moving offshore, the ocean takes up carbon through physical and biological processes. At the ocean's surface, carbon dioxide from the atmosphere dissolves into the water. Tiny marine plants called phytoplankton use this carbon dioxide for photosynthesis. Phytoplankton are the base of the marine food web. After animals eat the plants, they breathe out the carbon or pass it up the food chain. Sometimes phytoplankton die, decompose, and are recycled in the surface waters. Phytoplankton can also sink to the bottom of the ocean, where they become buried in marine sediment. Over long time scales, this process has made the ocean floor the largest reservoir of carbon on the planet. In a process called upwelling, currents bring cold water containing carbon up to the surface. As the water warms, the carbon is then be released as a gas back into the atmosphere, continuing the carbon cycle.

Carbon is found in the atmosphere as Carbon dioxide, which is a greenhouse gas. Greenhouse gases act like a blanket, and trap heat in the atmosphere. In the past two centuries, humans have increased atmospheric carbon dioxide by more than 30%, by burning fossil-fuels and cutting down forests.

Carbon is the basic building block of life, and these unique atoms are found everywhere on Earth. Carbon makes up Earth's plants and animals, and is also stored in the ocean, the atmosphere, and the crust of the planet. A carbon atom could spend millions of years moving through Earth in a complex cycle. This conceptual animation provides an illustration of the various parts of the Carbon cycle. Purple arrows indicate the uptake of Carbon; yellow arrows indicate the release of Carbon.

Credit: NASA/Goddard Space Flight Center/UMBC


(5) The Nitrogen Cycle - A Stop-Motion Picture (Watch this first before the next one)


http://www.youtube.com/watch?v=6GLIzlUD-zw


(6) The Nitrogen Cycle - It's Easy! 





(7) NASA: Keeping up with Carbon





(8) Earth: Our Earth





(9) Earth in Wide Angle?





(10) Human Impact on the Environment 

(11) Shocking Facts you did not know a minute ago




(12) What a girl said: for 5 minutes 






Happy viewing people! =))

Yours,
Mrs Lehming