Top answers

How is the heart beat controlled?

Cardiac muscle is myogenic i.e has the ability to contract naturally, without external stimuli, such as action potentials arriving via nerves. For the whole heart to contract in an organised manner, there ne...
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Answered by Cezar B. • Biology tutor
3137 Views

Describe why diffusion is important in plants and animals

Diffusion is the movement of gases across a partially permeable membrane from a high concentration to a low concentration and is important to allow the movement of substances across cell membranes. For examp...
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Answered by Lucy D. • Biology tutor
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What is the probability of offspring (both male and female) being affected by haemophilia if both parents are unaffected?

Haemophilia is a sex-linked genetic recessive disease, meaning it is associated with a gene located on the X chromosome. As males have only one X chromosome, inheriting that chromosome will mean that they wi...
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Answered by Ella B. • Biology tutor
6282 Views

How does the heart pump oxygen around the body?

Our heart can be divided into a left and right side, each containing two chambers: an atrium and a ventricle. Low pressure blood flows into the atria and is pumped out of the ventricles (high pressure); thes...
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Answered by Ella B. • Biology tutor
4570 Views

What happens to the diaphragm during inspiration?

Diaphragm contracts which causes it to move downwards/become flatter
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Answered by Will H. • Biology tutor
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