Zoology-Hormones
NEET Zoology Hormones MCQ Question
Type: MCQ-numerical-Hard-Class 11
If the adrenal medulla secretes adrenaline leading to increased heart rate and rate of respiration, by what percentage would the heart rate increase if it originally was 70 beats per minute and increased to 105 beats per minute?
A
50%
B
33.3%
C
75%
D
100%
Correct Answer
Option A
Detailed Explanation
The percentage increase in heart rate is calculated using the formula ((new rate - original rate) / original rate) * 100. Here, ((105 - 70) / 70) * 100 = 50%. The context mentions that adrenaline increases heart rate, which justifies the calculation.
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