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What are the main functions of the Autonomic Nervous System (ANS), Peripheral Nervous System (PNS) and Central Nervous System (CNS)?

  • A

    ANS involuntarily controls organs, PNS connects the CNS to the rest of the body and transmits sensory information, and CNS processes and sends out motor commands.

  • B

    ANS initiates voluntary motor actions, PNS is responsible for cognitive functions and thinking processes, and CNS controls involuntary organ functions.

  • C

    ANS controls decision-making and cognitive functions, PNS involuntarily controls organs, and CNS handles sensory input from the external environment.

  • D

    ANS voluntarily controls organs, PNS connects the CNS to the rest of the body and transmits sensory information, and CNS processes and sends out motor commands.

Refer to figure.
THE NERVOUS SYSTEM

The nervous system is divided into:

1. Central Nervous System (CNS): The CNS consists of the brain and spinal cord and is the control center of the entire nervous system. Its primary functions include processing sensory information received from the PNS, integrating this information, and formulating appropriate motor responses. The CNS is also responsible for higher-order functions such as cognition, memory, decision-making, and consciousness.

2. Peripheral Nervous System (PNS): The PNS connects the central nervous system (CNS) to the rest of the body, including the limbs and organs by a vast network of nerves. It serves as a communication network between the CNS and the body's sensory receptors, muscles, and glands. The PNS has two main divisions: the sensory (afferent) division, which transmits sensory information from the body to the CNS, and the motor (efferent) division, which transmits commands from the CNS to muscles and glands.

  • Autonomic Nervous System (ANS): The ANS is a subpart of the Peripheral Nervous System (PNS) and is responsible for regulating involuntary bodily functions and maintaining homeostasis. It controls various internal organs and processes such as heart rate, digestion, respiratory rate, and blood pressure. The ANS has two main branches: the sympathetic nervous system (which prepares the body for "fight or flight" responses) and the parasympathetic nervous system (which promotes "rest and digest" functions).

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