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What is a reflex arc and why is it important?

A reflex arc is made up of a receptor (which detects a stimulus), a sensory neurone , a relay neurone , a motor neurone and an effector (which brings about a response). The neurones are not joined to each ot...
JB
Answered by Janella B. • Biology tutor
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Outline an example of a reflex action

Stimulus - receptor - sensory neuron - (dorsal) spinal cord - (ventral) spinal cord - motor neuron - muscle/effector - response
TA
Answered by Tunmise A. • Biology tutor
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Explain how increased blood CO2 leads to an increased heart rate

The high CO2 rate is detected by chemoreceptors in the aorta. The chemoreceptors send impulses to the medulla in the brain. The medulla then sends impulses along sympathetic neurons to the sinoatrial node in...
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Answered by Alice V. • Biology tutor
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Explain how the mitochondria plays an important role in sustaining life?

The mitochondria is an organelle important for aerobic respiration. This is a process which uses glucose and oxygen to produce adenosine triphosphate, carbon dioxide and water. ATP is a molecule needed to pr...
FW
Answered by Felyx W. • Biology tutor
2870 Views

Explain how the properties of water, that are essential to living things, arise from the 
dipolar nature of water

a oxygen in water ‹ slightly › negatively charged and hydrogens ‹ slightly › positive b hydrogen bonding due to the dipolar nature c water molecules are cohesive due to hydrogen bonding d cohesion useful in ...
Answered by • Biology tutor
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