question_answer

Human heart is myogenic and it is supplied with sympathetic and vagus nerve branches that are acceleratory and inhibitory in nature respectively. Which one of the following statement is incorrect w.r.t. the heart beat?

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