I'd say that it is C. by burning food molecules and releasing their energy as heat
Answer:
Heart valves or the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole and the closure of the aortic valve and pulmonary valve at the end of ventricular systole.
Explanation:
The heart tone “lub,” or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole.
The heart tone “dub,” or S2 ( a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole.
The producer would be
A) flower
Answer:
A
Explanation:
gregor Mendel experimented on plants and was able to discover genes, chromosomes.
Parasympathetic tone holds the resting heart rate below its intrinsic rate.
