SSC CHSL 2025 PYQ — Question 99

The correct answer is Option 2: II only (Spinal Cord).
Explanation:
In humans, the Central Nervous System (CNS) serves as the body's primary control center. It consists of only two main organs:
Brain: It is situated within the skull and acts as the main coordination center for all bodily activities.
Spinal Cord: It is a long bundle of nerves located within the vertebral column (spine). It facilitates the exchange of messages between the brain and the rest of the body and controls reflex actions.
Analysis of Options:

1. Heart (I): The heart is part of the Circulatory System, not the nervous system. Its primary function is to pump blood throughout the body.
2. Spinal Cord (II): As mentioned above, it is an integral part of the Central Nervous System.

Classification of the Nervous System (At a Glance):

• The human nervous system is primarily divided into two parts:
• Central Nervous System (CNS): The Brain and the Spinal Cord.
• Peripheral Nervous System (PNS): This includes all the nerves that originate from the CNS and extend throughout the body (such as cranial nerves and spinal nerves).

Important Facts for Upcoming Exams:

• Reflex Arc: Sudden actions (such as withdrawing one's hand upon touching a hot object) are controlled by the spinal cord.
• Parts of the Brain: Forebrain (Cerebrum), Midbrain, and Hindbrain (Cerebellum, Pons, Medulla).
• Protection: The brain is protected by the 'Cranium' (skull), while the spinal cord is protected by the 'Vertebral Column' (spine).

Potential Exam Question:
Question: Which part of the human body serves as the control center for reflex actions? Answer: Spinal Cord.
Question: What are the main components of the Peripheral Nervous System (PNS)?
Answer: Sensory and Motor Neurons.
Question: Which part of the brain is responsible for maintaining the body's balance?
Answer: Cerebellum.