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Describe which neurones are involved in coordinating a reflex action.

Reflexes are involuntary and instantaneous actions that occur in response to a stimulus, for example our pupils contracting in response to a bright light. The receptor detects this stimulus and sends an elec...
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Answered by James D. • Biology tutor
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Blue-spotted tree monitors (Varanus macraei) are found on the Indonesian island of Batanta. Describe how you could use the mark-release-recapture method to estimate the number of Varanus macraei on the island. (4 marks)

1.Capture/collect sample, mark and release 2.Method of marking does not harm/distinguish lizard 3.Leave sufficient time for lizards to (randomly) distribute (on island) before collecting a second sample 4.(P...
Answered by • Biology tutor
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Describe the cardiac cycle?

The blood enters the heart from the superior and inferior vena cava. It then enters the right atrium. When the atria fill with blood, it's known as atrial systole as they are relaxed. Once the atria have fil...
EC
Answered by Eva C. • Biology tutor
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Describe and explain how the mammalian respiratory system is adapted for efficient gas exchange.

The mammalian respiratory system is adapted for efficient gas exchange by increasing the rate of diffusion through targeted manipulations of Fick's law. These manipulations are centred around maximising surf...
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Answered by Ethan W. • Biology tutor
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How are fish are well adapted for gas exchange?

Gas exchange is important for fish as they need oxygen for respiration. Considering Fick’s law, in order to maximise the rate of gas exchange, fish have many gill filaments covered in lamellae, maximising th...
TD
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