The scientist who developed the first successful heart-lung machine was: MCQ with Answer and Explanation

Explanation:
The liver plays a crucial role in carbohydrate metabolism, storing excess glucose as glycogen and releasing it when blood sugar drops. The spleen acts as a blood filter, removing old, damaged, or abnormal red blood cells and storing platelets. The appendix is a small, blind-ended tube attached to the cecum; it has no significant role in human digestion and is considered a vestigial organ. Thus, statements 1 and 2 are correct.

Explanation:
CNS = brain + spinal cord. The peripheral nervous system (PNS) includes cranial and spinal nerves. The autonomic nervous system controls involuntary functions.

Explanation:
Enzymes speed up reactions by lowering activation energy and are not consumed; they remain unchanged after the reaction. Thus, statement 2 is false. 1 and 3 are correct.