A) In foetal heart the heart rate is \[140-130\] beats per minute
B) Mental status such as depression and grief decrease heart rate
C) An excess of \[C{{a}^{++}}\] ion decreases heart beat rate
D) High levels of \[N{{a}^{+}}\text{ }and\text{ }{{K}^{+}}\] decreases the strength of contraction
Correct Answer: C
Solution :
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