Question

1. how many chambers exist within the heart?
2. what are the upper chambers in the heart?
3. what are the lower chambers in the heart?
4. which chamber of the heart serves as the pacemaker allowing the electrical current within the heart to begin?
5. which chamber of the heart is the biggest and responsible for pumping blood out to the entire body?

what are the 4 valves in the heart?

Explanation:

For question 6, the human heart has four chambers. For question 7, the upper chambers are the atria (right atrium and left atrium). For question 8, the lower chambers are the ventricles (right ventricle and left ventricle). For question 9, the sino - atrial node (in the right atrium) acts as the pacemaker. For question 10, the left ventricle is the largest and pumps blood to the whole body. For the question about valves, the four heart valves are the tricuspid valve, pulmonary valve, mitral valve, and aortic valve.

Answer:

1. Four.
2. Right atrium and left atrium.
3. Right ventricle and left ventricle.
4. Right atrium (sino - atrial node within it).
5. Left ventricle.

Valves: Tricuspid valve, pulmonary valve, mitral valve, aortic valve.