Hormones and the endocrine systemIB MYP Biology: Mind map

Exam questions on Hormones and the endocrine system

1. Rania is crossing a quiet road in Amman when a car swerves towards her. She jumps back onto the pavement. Her heart is pounding and her breathing is fast, and these effects continue for several minutes after the car has gone.
   Explain why Rania's heart is still pounding several minutes after the danger has passed.2 marks
2. After a large meal of rice and fruit, the blood glucose concentration of a healthy student rises. Within about two hours it has returned to its normal level.
   Explain how the body brings the blood glucose concentration back to normal after the meal.2 marks
3. A scientist records two responses in a volunteer. Response X is pulling a hand away from a hot object: it begins 0.05 seconds after the stimulus and is over in less than a second. Response Y follows a sudden fright: a hormone is released, the first effects appear after about 30 seconds and they last for around 10 minutes.
   Identify which response is controlled by the nervous system and which by the hormonal system. Give two reasons.3 marks