The nervous system is composed of the central nervous system and peripheral nervous system. The central nervous system includes the brain and spinal cord, while the peripheral nervous system connects the central nervous system to other parts of the body. The nervous system allows for complexity, integration, adaptability, and electrochemical transmission of signals through neurons and neurotransmitters. It processes information through sensory input and motor output.

1. GENERAL
PSYCHOLOGY
CHAPTER II:

2. The Nervous System is the body’s
electrochemical communication
circuitry.
The field that studies the nervous
system is called neuroscience, and
the people who study it are called
neuroscientist.

3. The Nervous System is primarily
composed of the Central Nervous
System and the Peripheral Nervous
System.

4. 1. Complexity
2. Integration
3. Adaptability
4. Electrochemical Transmission

5. The brain and nervous system being complex allows
the individual to do activities of different kinds.
This is due to the orchestration
of the billions of cells in the brain
and the nervous system.

6. Integration refers to the ability
of the brain to pull information
together.

7. Although the composition of the brain and the
nervous system have hereditary foundation, both
have the ability to constantly adapt to the changes
in the body and the environment.
The term plasticity denotes the
brain’s special capacity for
modification and change.

8. The brain being the information
processing system, powered by
electrical impulses and chemical
messages allows the individual to
perceive and respond to stimuli.

9. 1. Afferent Nerves (Sensory Nerves)-transport
information to the brain.
Stimulus Sensory Receptors Afferent Nerves Brain

10. 2. Efferent Nerves (motor nerves)-carry the brain’s
output or response.
Brain Efferent Nerves Muscles (motor
behaviour response)

11. 3. Neural Networks-cluster of neurons that are
interconnected to process information by integrating
sensory input and motor output.

14. Peripheral Nervous System the network of nerves
that connect the brain and the spinal cord to other
parts of the body. It is divided into the somatic
nervous system and the autonomic nervous system.

15. Somatic Nervous System the division of the PNS
consisting of sensory nerves, whose function is
to convey information to the CNS, and motor
nerves, whose function is to transmit
information to the muscles.
Autonomic Nervous System the division of the
PNS that communicates with the body’s internal
organs. It consist of the sympathetic and the
parasympathetic nervous systems.

16. Sympathetic Nervous System the division of
the autonomic nervous system that arouses
the body.
Parasympathetic Nervous System the
division of the autonomic nervous system
that calms the body.

17. Soma or the cell body contains
the cell’s nucleus and is responsible
for the cell’s health and well-being.
Dendrites receive messages from
other neurons.
Axon transmits information on to
additional neurons.

18. The Myelin sheath is the layer of
fat cells that encases and insulates
most axons which help speed up
the transmission of nerve impulse.

19. The synapse is the branching end of
a neuron’s axon reach out to, but
do not touch, the dendrites.

21. 1. Acetylcholine (ACh) stimulates the firing of neurons and is involved
in the action of muscles, learning, and memory.
Deficiency in ACh will involve decline in memory storage and
Alzheimer’s disease.
2. Dopamine mainly inhibits and helps control the voluntary movement.
Dopamine affects sleep, mood, attention and learning (mainly in
planning, and the inhibition of irrelevant behaviours and ideas).
3. Serotonin also primarily inhibits. It also regulates sleep and
wakefulness, mood, attention and learning.

22. 4. Gamma Aminobutyric Acid (GABA) helps to control the preciseness of
the signal being carried from one neuron to the next.
Low level of GABA is linked to anxiety.
5. Norepinephrine usually inhibits the firing of neurons in the central
nervous system, but it excites the heart muscle, intestine, and urogenital
tract.
Stress stimulates the release of norepinephrine. Too little norepinephrine is
associated with depression, and too much is linked with agitated and manic
states.

23. 6. Endorphins are natural opiates that mainly stimulates the firing of
neurons. It shields the body from pain and elevates feelings of pleasure.

24. The Glial cells (neuroglia) provide
chemicals that a neuron need to
function properly.
they also serve as the clean up crew
by removing dead neurons and excess
neurotransmitter substances.

25.  Sensory Neuron
 Interneurons
 Motor Neurons

26. Resting Potential-the stable negative charge of
an inactive neuron.
Action Potential-the brief wave of electrical
charge that sweeps down the axon during the
transmission of a nerve impulse.

27. All-or-none Principle-once the electrical
impulse reaches a certain level of intensity, it
fires and over all the way down to the axon
without losing any of its intensity.

28. The human brain has three
major components:
1. the hindbrain;
2. the midbrain; and
3. the forebrain.

29. The hindbrain is made up of
several smaller structures
such as the medulla, the
pons, and the cerebellum.

30. The midbrain is composed
of two parts:
1. the reticular formation
(a.k.a. reticular
activating system or
RAS); and
2. 2. the brainstem.

31. The forebrain mainly
consists the following:
1. Cerebral cortex
2. Limbic system
3. Thalamus
4. Hypothalamus
5. Hippocampus
6. Amygdala

32. 1. Frontal lobe is largely responsible for
a wide variety of human activities such
as:
 language
 attention
 reasoning
 planning
 goal setting
 self monitoring
 decision making
 judgment
 learning strategies
 interpreting others’ behaviour

33. 2. Parietal lobes receive and
interpret somatosensory
information.
3. Occipital lobes
4. Temporal lobes

35. The Endocrine System is a set of glands that regulate the
activities of certain organs by secreting hormones to the
bloodstream.
These hormones are chemical messengers that are
manufactured by the glands in the system. The endocrine
glands include the pituitary, thyroid, parathyroid, and
adrenal glands, the pancreas, ovaries, and testes.

37. 1. Pituitary Gland-is located at the base of the
skull, regulates the secretion of growth hormone and
controls all other endocrine glands. It is known as
the master gland.
The anterior pituitary is controlled by the
hypothalamus.
2. Pineal Gland-also located in the brain, it secretes
the hormone melatonin, which regulates the sleep
and wake cycle.

38. 3. Thyroid Gland-locate inside the neck and
secretes a hormone called thyroxin that regulates
metabolism (how fast the body burns its available
energy).
4. Pancreas-controls the blood sugar level by
secreting the insulin and glucagons.

39. 5. Adrenal Glands-one on top of each
kidney, produces the main hormone cortisol (steroid).
The adrenal glands regulate moods, energy, and the
ability to cope with stress.
They secrete epinephrine (adrenaline) and
norepinephrine (noradrenaline) in response to stress.
6. Gonads-produces sex hormones responsible for
primary and secondary sex characteristics.