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Nervous System Overview
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Nervous System Overview
Ch.2 Nervous System Overview
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1
Question
What is the structure of the Central Nervous System (CNS)?
Answer
The Central Nervous System consists of the brain, which is divided into the cerebrum, cerebellum, and brainstem, and the spinal cord.
2
Question
What is the primary function of the Central Nervous System?
Answer
The primary function of the Central Nervous System is to process and coordinate information from sensory stimuli and to generate responses.
3
Question
What are the main components of the Peripheral Nervous System (PNS)?
Answer
The Peripheral Nervous System is composed of sensory (afferent) neurons that carry information to the CNS and motor (efferent) neurons that carry signals from the CNS to the muscles and glands.
4
Question
What is the role of sensory neurons in the PNS?
Answer
Sensory neurons in the PNS are responsible for carrying information from sensory receptors (such as those for touch, pain, temperature, vision, etc.) to the Central Nervous System.
5
Question
What is the difference between conscious and unconscious responses to stimuli?
Answer
Conscious responses involve awareness and deliberation, such as deciding to move your hand away from a hot surface; unconscious responses are reflexive and automatic, such as the withdrawal reflex.
6
Question
What are spinal reflexes and how do they function?
Answer
Spinal reflexes are quick, involuntary responses to certain stimuli that are processed in the spinal cord, allowing for a rapid response without direct involvement of the brain.
7
Question
What role do neurotransmitters play in the nervous system?
Answer
Neurotransmitters are chemical messengers that transmit signals across synapses between neurons, playing a critical role in communication within the nervous system.
8
Question
What is glutamate and its function in the nervous system?
Answer
Glutamate is the most abundant excitatory neurotransmitter in the brain, involved in synaptic plasticity, learning, and memory.
9
Question
What is the function of Gamma-amino butyric acid (GABA)?
Answer
GABA is the primary inhibitory neurotransmitter in the brain, helping to regulate neuronal excitability and prevent excessive brain activity.
10
Question
What are neuromodulators and how do they differ from neurotransmitters?
Answer
Neuromodulators are substances that can enhance or inhibit the effects of neurotransmitters on neurons, often having a broader impact on neuronal networks rather than direct synaptic transmission.
11
Question
What is the role of dopamine in the nervous system?
Answer
Dopamine is a neurotransmitter associated with pleasure, reward, and motor control; its dysfunction is linked to conditions such as Parkinson's disease and schizophrenia.
12
Question
What function does serotonin serve in the nervous system?
Answer
Serotonin is a neurotransmitter that contributes to mood regulation, appetite, sleep, and is involved in various functions such as cognition and learning.
13
Question
What is synaptic plasticity and its significance in learning?
Answer
Synaptic plasticity is the ability of synapses to strengthen or weaken over time, crucial for learning and memory formation as it underlies the changes in neuron connections.
14
Question
Explain sprouting, rerouting, and pruning in the context of neural connections.
Answer
Sprouting is the formation of new synaptic connections, rerouting involves redirecting existing synaptic connections, and pruning is the elimination of unnecessary connections to enhance efficiency.
15
Question
What is long-term potentiation (LTP) and its relevance to memory?
Answer
Long-term potentiation is a lasting increase in synaptic strength following high-frequency stimulation of a synapse, and it is believed to be a cellular mechanism underlying learning and memory.
16
Question
What is long-term depression (LTD) and its role in the nervous system?
Answer
Long-term depression is a persistent decrease in synaptic strength following low-frequency stimulation, serving as a mechanism for synaptic plasticity and possibly helping to refine neural circuits.
17
Question
What is the significance of understanding nervous system functioning for health and disease?
Answer
Understanding nervous system functioning is vital for diagnosing and treating neurological disorders, developing therapies, and enhancing cognitive and behavioral health.
18
Question
What is the primary function of neural synapses?
Answer
Neural synapses transmit information between neurons, allowing for communication within the nervous system.
19
Question
What are the two types of neurotransmitters that affect neural transmission and what are their functions?
Answer
Excitatory neurotransmitters (like glutamate) enhance the activity of the receiving neuron, while inhibitory neurotransmitters (like gamma-amino butyric acid, GABA) decrease the activity of the receiving neuron.
20
Question
Define neuromodulators and provide two examples.
Answer
Neuromodulators are chemicals in the brain that do not directly cause excitatory or inhibitory effects but modulate the activity of neurons, affecting a range of brain functions. Examples include dopamine and serotonin.
21
Question
What is synaptic plasticity and why is it important?
Answer
Synaptic plasticity refers to the ability of synapses to strengthen or weaken over time, which is essential for memory formation and learning. It includes processes such as long-term potentiation (LTP) and long-term depression (LTD).
22
Question
What are long-term potentiation (LTP) and long-term depression (LTD)?
Answer
LTP is a lasting increase in synaptic strength following high-frequency stimulation, enhancing communication between neurons. LTD is a long-lasting decrease in synaptic strength following low-frequency stimulation, reducing communication between neurons.
23
Question
Describe the concepts of sprouting, rerouting, and pruning in the context of neural connections.
Answer
Sprouting refers to the growth of new synaptic connections, while rerouting involves the reorganization of existing connections to adapt to new experiences or learning. Pruning is the process of removing weaker or unnecessary neural connections to optimize brain efficiency.
24
Question
What role does the nervous system play in human functioning?
Answer
The nervous system is an organized network of specialized cells that allows the brain to receive information from both internal and external environments, regulating everything from sensing and perceiving to learning and remembering.
25
Question
How does the nervous system control everyday activities?
Answer
The nervous system controls everyday activities through coordination and communication among sensory input, processing in the brain, and motor output, guiding responses to stimuli.
26
Question
What are the implications of neurotransmitter imbalances on psychological and neurological health?
Answer
Imbalances in neurotransmitters like dopamine and serotonin can lead to various mental health issues, such as depression, anxiety, and neurodegenerative diseases, affecting mood, behavior, and cognitive functions.
27
Question
Can learning and memory be affected by synaptic changes at the neural level?
Answer
Yes, learning and memory are directly influenced by synaptic changes such as strengthening (LTP) and weakening (LTD) of connections, as well as through the processes of sprouting and pruning.
28
Question
In the context of psychology, what is the significance of understanding synaptic transmission and plasticity?
Answer
Understanding synaptic transmission and plasticity is vital for psychology as it provides insight into the biological underpinnings of behavior, emotion, cognition, and learning processes, which can inform treatment for psychological disorders.
29
Question
What are the main functions of the nervous system?
Answer
The main functions of the nervous system are to receive information, process information, and coordinate a response to information.
30
Question
What types of responses does the nervous system control?
Answer
The nervous system controls voluntary responses such as speaking and moving, as well as involuntary responses like breathing, heartbeat, squinting from bright lights, and emotional reactions such as feeling butterflies in the stomach.