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Biology

A Level

What is the sequence of events for muscle contraction?

· The myosin head attaches to the myosin binding site on the actin filament forming an actinomyosin bridge· ATP is hydrolysed to ADP and inorga...

Answered by Letisha B. • Biology tutor

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How does insulin contribute to the regulation of blood glucose control?

When high levels of glucose are detected in the blood, for example after a big meal, insulin is released from beta cells in the Islet of Langerhans. These are clusters of cells present in the pancreas.

Answered by Leah C. • Biology tutor

2131 Views

How do we know whether our results indicate whether or not there is a relationship between our variables?

We can test for 'significance' in order to determine whether it's likely that the results that we see are due to random chance or due to a relationship between them. This involves using a statistical test...

Answered by HENRY S. • Biology tutor

2307 Views

Describe how oxygen in the air reaches capillaries surrounding alveoli in the lungs?

The air that is breathed in passes down the trachea, the bronchi and bronchioles before reaching the alveoli. Oxygen is able to diffuse across the walls of the alveoli and the pulmonary capillaries into t...

Answered by Jennifer W. • Biology tutor

19164 Views

What is the function of ATP and explain how is it suitable for its function

ATP is a molecule called adenosine triphosphate, used to provide energy for various reactions within the cell and hence sometimes called 'universal currency' of the cell. ATP molecule is made of adenine, ...

Answered by Antonina K. • Biology tutor

14021 Views