Answer:
3) 30-40 beats per minute.
Explanation:
It's usually 30-40.
I believe the answer is (B) Skeletal.
Effectiveness and safety?
Answer:
Ventricles
Explanation:
The left ventricle recieves the blood from left atria which in turn recieves blood from the pulmonary vein that brings oxygenated blood from heart.
Next, the right ventricle receives blood from right atria which gets it's blood from vena cava, which brings deoxygenated blood from lower and upper half of body.
