Answer:
The human heart contains an estimated 2–3 billion cardiac muscle cells, but these account for less than a third of the total cell number in the heart.
Explanation:
The carotid baroreceptors become less active, venous return is decreased, heart rate is reflexively elevated, and reflex vasoconstriction of peripheral blood vessels occur.
I will need the picture or information to answer this.
D smoking damages cilia in the trachea and more particles enter the lungs
