Top answers

Describe the process of ventilation, including the difference between active and passive expiration.

To expand the lungs and fill them with air, thoracic pressure decreases. This is done by the diaphragm contracting and flattening out and the external intercostal muscles raising the ribcage upwards and outw...
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Answered by Steph G. • Biology tutor
10871 Views

How do fish ventilate their gills?

Unlike mammals fish have water as their gas exchange medium instead of air. Fish use gills for gas exchange, gills are specialised flaps of tissue which have the following features to allow efficient gas exc...
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Answered by Meg H. • Biology tutor
9411 Views

Explain the cardiac cycle

basic anatomy of the heart: chambers, valves, structural difference between right and left side of the heart pulmonary vs. systemic circulation blood flow through the heart
UT
Answered by Umamah T. • Biology tutor
3126 Views

Describe the differences between mitosis and meiosis and when would these occur in mammalian cells?

Both mitosis and meiosis use cytokinesis for the division of genetic informaton between cells, however mitosis creates identical copies known as daughter cells after just one round of cell division, whereas ...
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Answered by Aimee D. • Biology tutor
3360 Views

What are the different types of finance available to a business

Sources of finance can be grouped through type and time. ‘Types’ include internal finance and external finance whilst ‘time’ involves short, medium and long term. For internal sources of finance the business...
GM
2710 Views