Your heart works by:
(1 point)
Responses
entirely voluntary muscle contraction.
entirely voluntary muscle contraction.
entirely involuntary muscle contraction.
entirely involuntary muscle contraction.
a balanced mix of voluntary and involuntary muscle contraction.
a balanced mix of voluntary and involuntary muscle contraction.
almost entirely involuntary muscle contraction, but sometimes voluntary contraction.
3 answers
almost entirely involuntary muscle contraction, but sometimes voluntary contraction.
No guessing
almost entirely involuntary muscle contraction, but sometimes voluntary contraction.
1 answer