BIO201 – Topic 20: The Human Nervous System and Neural Coordination
© Lesuyai Organic Guides 2025
(Original | Educational | Professional | Plagiarism-Free | A4 Academic Format)
20.1 Introduction
The nervous system is a rapid communication system responsible for receiving, interpreting, and
responding to stimuli.
20.2 Definition of the Nervous System
The nervous system is a network of specialized cells that coordinate body activities by transmitting
electrical impulses.
20.3 Components of the Central and Peripheral Nervous Systems
Central Nervous System (CNS): Brain and spinal cord.
Peripheral Nervous System (PNS): Sensory and motor nerves connecting the CNS to the body.
20.4 Structure and Function of Neurons
A neuron consists of dendrites (receive impulses), cell body, and axon (conducts impulses).
Neurons transmit rapid electrical signals.
20.5 Transmission of Nerve Impulses
Nerve impulses move along neurons through electrical depolarization and transmit across
synapses using neurotransmitters.
20.6 Reflex Action and Reflex Arc
A reflex is an automatic response. A reflex arc includes receptor, sensory neuron, interneuron,
motor neuron, and effector.
20.7 Autonomic Nervous System (ANS)
Sympathetic: prepares the body for action (fight or flight).
Parasympathetic: restores normal body functions (rest and digest).
20.8 Coordination Between Nervous and Endocrine Systems
The hypothalamus links neural signals to hormonal responses, ensuring coordinated body
regulation.
20.9 Nervous System Disorders
Examples: Epilepsy, stroke, meningitis, Parkinson’s disease, neuropathy.
20.10 Summary
The nervous system enables perception, integration, and coordinated responses essential for
survival.
EXAM SECTION – STRUCTURED QUESTIONS WITH ANSWERS
1. Define a neuron.
Answer: A neuron is a specialized cell that transmits electrical impulses within the nervous system.
2. State two differences between CNS and PNS.
Answer: CNS includes the brain and spinal cord; PNS includes nerves. CNS processes information;
PNS transmits signals to and from CNS.
3. What is a reflex action?
Answer: A reflex action is an automatic, rapid response to a stimulus without conscious control.
4. Name two neurotransmitters.
Answer: Examples include acetylcholine and dopamine.
ESSAY QUESTION WITH ANSWER
Discuss the structure and functions of the human brain.
© Lesuyai Organic Guides 2025
(Original | Educational | Professional | Plagiarism-Free | A4 Academic Format)
20.1 Introduction
The nervous system is a rapid communication system responsible for receiving, interpreting, and
responding to stimuli.
20.2 Definition of the Nervous System
The nervous system is a network of specialized cells that coordinate body activities by transmitting
electrical impulses.
20.3 Components of the Central and Peripheral Nervous Systems
Central Nervous System (CNS): Brain and spinal cord.
Peripheral Nervous System (PNS): Sensory and motor nerves connecting the CNS to the body.
20.4 Structure and Function of Neurons
A neuron consists of dendrites (receive impulses), cell body, and axon (conducts impulses).
Neurons transmit rapid electrical signals.
20.5 Transmission of Nerve Impulses
Nerve impulses move along neurons through electrical depolarization and transmit across
synapses using neurotransmitters.
20.6 Reflex Action and Reflex Arc
A reflex is an automatic response. A reflex arc includes receptor, sensory neuron, interneuron,
motor neuron, and effector.
20.7 Autonomic Nervous System (ANS)
Sympathetic: prepares the body for action (fight or flight).
Parasympathetic: restores normal body functions (rest and digest).
20.8 Coordination Between Nervous and Endocrine Systems
The hypothalamus links neural signals to hormonal responses, ensuring coordinated body
regulation.
20.9 Nervous System Disorders
Examples: Epilepsy, stroke, meningitis, Parkinson’s disease, neuropathy.
20.10 Summary
The nervous system enables perception, integration, and coordinated responses essential for
survival.
EXAM SECTION – STRUCTURED QUESTIONS WITH ANSWERS
1. Define a neuron.
Answer: A neuron is a specialized cell that transmits electrical impulses within the nervous system.
2. State two differences between CNS and PNS.
Answer: CNS includes the brain and spinal cord; PNS includes nerves. CNS processes information;
PNS transmits signals to and from CNS.
3. What is a reflex action?
Answer: A reflex action is an automatic, rapid response to a stimulus without conscious control.
4. Name two neurotransmitters.
Answer: Examples include acetylcholine and dopamine.
ESSAY QUESTION WITH ANSWER
Discuss the structure and functions of the human brain.
