Which of the following constitutes a heart beat ?
2 points
Filling of blood in the heart chambers.
The change in the speed of blood flow inside the heart chambers
Rhythmic contraction and relaxation of heart muscles
The opening of valves present in between the heart chambers
Answers
Answered by
0
Answer:
heart chambers. ....hey
Answered by
0
Explanation:
By the end of this section, you will be able to:
in Figure 21.10. Coronary circulation intrinsic to the heart takes blood directly from the main artery (aorta) coming from the heart. For pulmonary and systemic circulation, the heart has to pump blood to the lungs or the rest of the body, respectively. In vertebrates, the lungs are relatively close to the heart in the thoracic cavity. The shorter distance to pump means that the muscle wall on the right side of the heart is not as thick as the left side which must have enough pressure to pump blood all the way to your big toe.
Similar questions