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Outline the structures involved in the mammalian gaseous exchange system. For each structure explain how it increases the efficiency of gaseous exchange [6 marks]

Trachea- c shaped cartilage provides structure and support, goblet cells and ciliated epithelium, secrete mucus to trap dust and pathogens and waf...

Answered by • Biology tutor

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How do vaccinations work and what is their role in herd immunity?

Vaccinations are given to provide immunity and protection against a certain disease or pathogen. The vaccine itself contains a weakened 'version' of the pathogen that retains its antigens but not its abil...

Answered by • Human Biology tutor

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Describe how a simple Reflex works.

Reflexes allow you to respond to a stimuli (change in environment). A simple reflex begins with a receptor which are found in sense organs and allow you to detect the stimuli. An example of a sense organ ...

Answered by Mira M. • Biology tutor

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A Block of mass 2kg is on an a smooth inclined plane where sin@ = 3/5 at point A. Point B is 5 meters down the incline. Find the time it will take for the block to reach point given it is at rest at point A.

So to start with draw a free body diagram of a block on the slope at point A with the forces acting on it which will be the downward force of mass x g (2g) due to gravity and the reaction force 2gcos@. Th...

Answered by Harry S. • Maths tutor

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(AQA English Language Paper 1 Question 5 - Creative Writing) Write a story with the title, 'The Holiday'. [40 marks]

I never wanted to be here in the first place. After two trains, three buses and hours of car journey we find ourselves in the middle of nowhere. Yesterday we arrived late evening and the whole family was ...

Answered by Zoe A. • English tutor

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