The body’s first line of defence

https://www.sciencelearn.org.nz/resources/177-the-body-s-first-line-of-defence
Your body has a two-line defence system against pathogens (germs) that make you sick. Pathogens ...

The body’s second line of defence

https://www.sciencelearn.org.nz/resources/178-the-body-s-second-line-of-defence
If the pathogens are able to get past the first line of defence, for example, through a cut in ...

Bacteria – good, bad and ugly

https://www.sciencelearn.org.nz/resources/588-bacteria-good-bad-and-ugly
Bacteria range from the essential and useful, to the harmful. Essential bacteria Without the ...

Macronutrients

https://www.sciencelearn.org.nz/resources/534-macronutrients
Nutrients are substances needed for growth, energy provision and other body functions ...

Large intestine function

https://www.sciencelearn.org.nz/resources/1832-large-intestine-function
Recent research has revealed that the large intestine and its resident bacterial population ...

Digestion – breaking the large into the small

https://www.sciencelearn.org.nz/resources/1830-digestion-breaking-the-large-into-the-small
Digestion of food involves both physical and chemical processes. Through digestion, large food ...

The human digestive system

https://www.sciencelearn.org.nz/resources/1829-the-human-digestive-system
The human digestive system consists of a long muscular tube and several accessory organs such ...

Modern biotechnology

https://www.sciencelearn.org.nz/resources/1206-modern-biotechnology
The discovery that genes are made up of DNA and can be isolated, copied and manipulated has led ...

Microorganisms – friend or foe?

https://www.sciencelearn.org.nz/resources/176-microorganisms-friend-or-foe
We can’t see them. We can’t hear them or feel them, but they are with us. There are 10 trillion ...

Using isotopes as tracers

https://www.sciencelearn.org.nz/resources/1801-using-isotopes-as-tracers
Radioactive isotopes have many useful applications in a wide variety of situations, for ...

Rate of digestion

https://www.sciencelearn.org.nz/resources/1834-rate-of-digestion
Digestion of food involves chemical reactions that break up large food molecules into their ...

Hormonal control of digestion

https://www.sciencelearn.org.nz/resources/1836-hormonal-control-of-digestion
It has now been well established that gut hormones have a key role in controlling food intake ...

Digestion chemistry – introduction

https://www.sciencelearn.org.nz/resources/1826-digestion-chemistry-introduction
Food plays an extremely important part in the lives of all humans. After ingestion, the food is ...

Energy requirements of the body

https://www.sciencelearn.org.nz/resources/1835-energy-requirements-of-the-body
The macronutrients (carbohydrates, proteins, fats and oils) we consume in our diet help to ...

History of xenotransplantation

https://www.sciencelearn.org.nz/resources/1214-history-of-xenotransplantation
Xenotransplantation was attempted unsuccessfully in the early 1900s. Several key research ...

Xenotransplantation – introduction

https://www.sciencelearn.org.nz/resources/1213-xenotransplantation-introduction
Xenotransplantation is when living cells, tissues or organs are transplanted between species ...

Stem cell research – timeline

https://www.sciencelearn.org.nz/resources/1967-stem-cell-research-timeline
The last 10 years have seen a huge increase in research into stem cells, but when did it all ...

Gel electrophoresis can be used to find genes associated ...

https://www.sciencelearn.org.nz/resources/2053-gel-electrophoresis-can-be-used-to-find-genes-associated-with-a-disease
In this simulated case, the researchers are looking for DNA fragments that are only found in ...

Breeding a new apple cultivar

https://www.sciencelearn.org.nz/resources/844-breeding-a-new-apple-cultivar
Breeding a new apple cultivar takes a long time and involves many steps. The aim is to produce ...

Xenotransplantation – timeline

https://www.sciencelearn.org.nz/resources/2125-xenotransplantation-timeline
This timeline features some of the key events in xenotransplantation from the early 1900s until ...

Virus strains

https://www.sciencelearn.org.nz/resources/184-virus-strains
A virus is a very simple thing – a coat of protein wrapped around some genetic code (DNA or ...

Developments in medical imaging – timeline

https://www.sciencelearn.org.nz/resources/1906-developments-in-medical-imaging-timeline
This timeline provides a look at some of major developments in medical imaging. 8 November 1895 ...

Spreading diseases

https://www.sciencelearn.org.nz/resources/192-spreading-diseases
In this activity, students model how a virus spreads through a group. By the end of this ...

Breeding red-fleshed apples – introduction

https://www.sciencelearn.org.nz/resources/839-breeding-red-fleshed-apples-introduction
Find out how and why a red-fleshed apple variety is being bred in New Zealand, and discover how ...
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