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It is important that our body maintains a constant internal environment - OCR Gateway - GCSE Biology (Combined Science) - Question 11 - 2021 - Paper 1
Question 11
It is important that our body maintains a constant internal environment. Complete these sentences about maintaining a constant internal environment. You can use ea... show full transcript
Worked Solution & Example Answer:It is important that our body maintains a constant internal environment - OCR Gateway - GCSE Biology (Combined Science) - Question 11 - 2021 - Paper 1
Step 1
Complete these sentences about maintaining a constant internal environment.
Answer
The body needs a constant internal environment so that metabolic reactions take place at an appropriate rate. The body needs to maintain oxygen levels so that aerobic respiration can take place. Blood sugar levels are controlled by the hormone insulin.
Step 2
Step 3
Step 4
Explain how the reflex arc prevents too much damage from the hot pan.
Answer
The reflex arc allows for a rapid response to potentially harmful stimuli. When the hand touches the hot pan, sensory receptors send an impulse via sensory neurones to the spinal cord. This is processed almost instantaneously, and a response is sent back through motor neurones to the muscles in the arm, causing it to retract quickly, thus minimizing injury.
Step 5
Use data from Fig. 11.2 to describe the effect of caffeine on reaction time.
Answer
From the data in Fig. 11.2, it can be observed that the group consuming caffeine (Group B) showed an increased mean reaction time 20 minutes after the drink when compared to the reaction time before and 10 minutes after. Specifically, the mean reaction time increases significantly in Group B after caffeine intake, indicating that caffeine has a stimulatory effect that may initially enhance response time but leads to slower reactions afterward.