A. Ventricles
B. Platelets
C. Corpuscles
D. Atrium
Answer & Solution
Option: D
Explanation :A normal heart has two upper and two lower chambers.The upper chambers are called atrium (or auricle), and the lower chamber is called a ventricle. The heart valves, which keep blood flowing in the right direction, are gates at the chamber openings.
Explanation :A normal heart has two upper and two lower chambers.The upper chambers are called atrium (or auricle), and the lower chamber is called a ventricle. The heart valves, which keep blood flowing in the right direction, are gates at the chamber openings.
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