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Biology
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Describe the structure of muscle and how it contracts

Muscle is made of many myofibrils. These contain many myofilaments. Within each myofilaments is a string of sarcomeres. Each sarcomere contains myosin (thick filaments) and actin (thin filaments). Myosin ...

Answered by Luke W. Biology tutor
2275 Views

How do vaccinations work?

Vaccinations contain a dead or inactive form of a pathogen, which is a disease causing microorganism (such as bacteria and viruses). When people are vaccinated, the inactivated pathogen goes through the b...

Answered by Toluwaniyin O. Biology tutor
2216 Views

How does a white blood cell ingest and kill a bacteria?

White blood cells can kill pathogens in multiple ways, one of these is called phagocytosis. During phagocytosis, a specific white blood cell called a phagocyte recognises the bacteria through a process ca...

Answered by Beth F. Biology tutor
12247 Views

Describe the structure of DNA

DNA is made up of two anti-parallel strands running in opposite directions. It is made up of individual monomers called nucleotides which in turn contain: a sugar (deoxyribose), a base (A, G, C or T), and...

Answered by Jamie H. Biology tutor
2127 Views

Explain what the P wave, QRS complex and T wave mean on an ECG?

P wave - atrial systole. This is when both atria of the heart contract, to force blood from the atria to the ventricles. The valves that separates the left atrium and the left ventricle i...

Answered by Ankit G. Biology tutor
6318 Views

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