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Series 2: Organisation of plants and animals

3. The human circulatory system

The structure of the heart and the main blood vessels that move blood in and out of it.

• 10 mins

Series 2: Organisation of plants and animals

4. Non-communicable diseases

Dr Alex looks at the differences between communicable and non-communicable diseases.

• 9 mins

Series 2: Organisation of plants and animals

5. The effect of lifestyle on non-communicable diseases

Risk factors which can increase the chances of someone developing a disease.

• 10 mins

Series 2: Organisation of plants and animals

6. Plant tissues and organs

Dr Alex Lathbridge breaks down the key facts about how plants are organised.

• 10 mins

Series 3. Infection and Response

1. Communicable diseases

How communicable diseases - viruses, bacteria, fungi and protists - are spread.

• 11 mins

Series 3. Infection and Response

2. Human defence against infection

How non-specific defence systems protect humans against pathogens.

• 11 mins

Series 3. Infection and Response

3. Vaccination, antibiotics and painkillers

How vaccinations work using antibodies and lymphocytes, and the concept of herd immunity.

• 11 mins

Series 3. Infection and Response

4. Drug discovery

How drugs are tested for their safety, their efficacy, and what the optimum dose might be.

• 10 mins

Series 3. Infection and Response

5. Monoclonal antibodies

How monoclonal antibodies are made and their use in pregnancy tests and cancer treatment.

• 9 mins

Series 3. Infection and Response

6. Plant disease

The physical and chemical defences that protect plants against pathogens.

• 9 mins

Series 4: Homeostasis and response

1. Homeostasis

The maintenance of a constant internal environment in the body.

• 10 mins

Series 4: Homeostasis and response

2. The human nervous system

Dr Alex Lathbridge breaks down how neurotransmitters travel across a synapse.

• 10 mins

Series 4: Homeostasis and response

3. The human endocrine system

Dr Alex Lathbridge explains hormones and the six key glands that produce them.

• 9 mins

Series 4: Homeostasis and response

4. Blood glucose

Dr Alex Lathbridge examines what happens if blood glucose levels get too high or too low.

• 9 mins

Series 4: Homeostasis and response

5. Hormones and the menstrual cycle

Dr Alex Lathbridge explains what happens at each stage of the menstrual cycle.

• 11 mins

Series 4: Homeostasis and response

6. The brain and eye

Dr Alex Lathbridge breaks down the structure of the brain and the eyes.

• 10 mins

Series 4: Homeostasis and response

7. Water and nitrogen balance

How the kidneys maintain water levels in the body and how nitrogen is balanced.

• 9 mins

Series 4: Homeostasis and response

8. Plant hormones

How hormones help plants to grow in response to light and gravity.

• 9 mins

Series 5: Inheritance, variation and evolution

1. Reproduction

Dr Alex Lathbridge breaks down the key facts about sexual and asexual reproduction.

• 8 mins

Series 5: Inheritance, variation and evolution

2. Inheritance

How genetics determine biological sex and inherited health disorders.

• 10 mins

Series 5: Inheritance, variation and evolution

3. Variation

Why variation happens within one species and the genetic and environmental causes.

• 8 mins

Series 5: Inheritance, variation and evolution

4. Evolution

What evolution is and the four key stages of the process of natural selection.

• 9 mins

Series 5: Inheritance, variation and evolution

5. Evidence for evolution

Dr Alex Lathbridge breaks down the different types of scientific evidence for evolution.

• 10 mins

Series 5: Inheritance, variation and evolution

6. Changing organisms

How selective breeding and genetic engineering happens in a laboratory, pros and cons.

• 11 mins

Series 5: Inheritance, variation and evolution

7. Classification

The Linnean System, the Three-Domain System and the Binomial System.

• 10 mins

Series 6: Ecology

1. Organisation of ecosystems

How food chains are formed and how predators and prey interact.

• 11 mins

Series 6: Ecology

2. Biotic and abiotic factors

The resources that plants and animals compete for and the factors that can change.

• 10 mins

Series 6: Ecology

3. The carbon cycle

What happens to carbon at each stage of the cycle and the different processes involved.

• 8 mins

Series 6: Ecology

4. The water cycle

The important processes throughout the cycle and what happens to water during each stage.

• 8 mins

Series 6: Ecology

5. Decomposition

Factors that determine the rate of decomposition including temperature, water and oxygen.

• 9 mins