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Describe how the structures involved in a reflex action help co-ordinate a reflex: (image with receptor, effector, spinal cord, synapse and neurones)

A receptor detects a stimulus e.g. pressure. The receptor generates electrical signals. Neurones conduct impulses, a sensory neurone conducts to the spinal cord. There is a synapse between the neurones and t...
PA
Answered by Pareya A. • Biology tutor
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What is the process of gas exchange in the alveoli?

So as we know, the job of the lungs is to transfer oxygen from the outside atmosphere into the body while also removing waste products that the body has produced and needs to get rid of- carbon dioxide. The ...
MA
Answered by Mohammad A. • Biology tutor
6189 Views

Below is a diagram of a sperm cell. Describe how the long tail and mitochondria aid in the sperms function (2 marks)

1- The long tail helps the sperm to swim towards the egg. Also makes the sperm more streamlined to get to the egg quicker. 2- The mitochondria release energy which enable the sperm to swim towards the egg.
YB
Answered by Yazmin B. • Biology tutor
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What is the difference between communicable and non-communicable diseases?

Communicable diseases are diseases that can be transferred from one person or organism to another, for example colds are spread by airborne droplets and malaria is spread through mosquito bites. Non-communic...
EB
Answered by Ellie B. • Biology tutor
4684 Views

Explain the difference between osmosis and diffusion.

Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration, through a partially permeable membrane.Diffusion is the movement of molecules from an area of hi...
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Answered by Alexander R. • Biology tutor
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