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 ...

Digestive enzymes

https://www.sciencelearn.org.nz/resources/1840-digestive-enzymes
Enzymes are globular proteins that control biological reactions. Digestive enzymes speed up the ...

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 ...

What levers does your body use?

https://www.sciencelearn.org.nz/resources/1924-what-levers-does-your-body-use
Muscles and bones act together to form levers. A lever is a rigid rod (usually a length of ...

Cell organelles

https://www.sciencelearn.org.nz/resources/499-cell-organelles
Every cell in your body contains organelles (structures that have specific functions). Just ...

Energy for exercise

https://www.sciencelearn.org.nz/resources/1920-energy-for-exercise
Why is a muscle like a motor bike? Although muscles and engines work in different ways, they ...

Food’s journey through the digestive system

https://www.sciencelearn.org.nz/resources/1849-food-s-journey-through-the-digestive-system
A look at the time it takes for food to pass through the gut from mouth to anus. In a healthy ...

DNA profiling

https://www.sciencelearn.org.nz/resources/1980-dna-profiling
DNA profiling is the process where a specific DNA pattern, called a profile, is obtained from a ...

Measuring sound

https://www.sciencelearn.org.nz/resources/573-measuring-sound
Sound is a pressure wave caused when something vibrates, making particles bump into each other ...

Muscle structure - muscle under the microscope

https://www.sciencelearn.org.nz/resources/1917-muscle-structure-muscle-under-the-microscope
Does all muscle look the same? If you were to look at skeletal, smooth and cardiac muscle using ...

Mitochondria – cell powerhouses

https://www.sciencelearn.org.nz/resources/1839-mitochondria-cell-powerhouses
Mitochondria are tiny organelles inside cells that are involved in releasing energy from food ...

Impacts of biotechnology on society

https://www.sciencelearn.org.nz/resources/1209-impacts-of-biotechnology-on-society
Biotechnology has helped improve the quality of people’s lives for over 10,000 years. Today’s ...

What are ceramics?

https://www.sciencelearn.org.nz/resources/1769-what-are-ceramics
A ceramic is an inorganic non-metallic solid made up of either metal or non-metal compounds ...

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 ...

What is clay?

https://www.sciencelearn.org.nz/resources/1771-what-is-clay
Since the earliest times, humankind has had a close association with clay. From use as a ...

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 ...

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 ...

Bone and tooth minerals

https://www.sciencelearn.org.nz/resources/1796-bone-and-tooth-minerals
The minerals found in human teeth and bones that give them their hardness and strength belong ...

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 ...
Load more