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Human Biology
Scottish Highers

Describe the basic structure and function of the heart

The heart is made up of two pump systems: right and left, each side contains an atrium and a ventricle making up a total of 4 chambers. The left ventricle wall is thicker than the right as it is required ...

Answered by Laura I. Human Biology tutor
3534 Views

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
2428 Views

From which cell type found in the gastrointestinal tract is cholecystokinin (CCK) secreted?

There are a wide range of enteroendocrine cell types (see below) but it is specifically the 'I-cells' of the duodenum that secrete CCK. CCK is responsible for modulation of bile secretion, exocrine pancre...

Answered by Callum G. Human Biology tutor
2932 Views

What role do natural killer cells and phagocytes play in the specific and non-specific destruction of pathogens?

With regards to the non-specific immune response, phagocytes engulf and digest pathogens through phagocytosis. Natural killer cells detect infected cells through monitoring the presence of particular sign...

Answered by Christopher C. Human Biology tutor
2325 Views

Explain the role of hormones in the menstrual cycle

If I asked this question of a student, I would suggest that they first try to draw a diagram to show how the various hormones relate to one another during the menstrual cycle. This is a complex topic, but...

Answered by Joanna P. Human Biology tutor
3212 Views

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