1. What are the two basic types of cells in the nervous system? Neurons and Glial Cells

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1 Biological Psychology Basic Structure of a Neuron 1. What are the two basic types of cells in the nervous system? Neurons and Glial Cells a. Cells that process incoming signals and respond by sending out signals of their own and are considered the basic building blocks of the brain s anatomy are called neurons b. Cells that aid in the transferring of a signal and help keep the basic structure of the nervous system intact and are necessary for neurons to function are called glial cells 2. All neurons have an outer membrane that helps protect information kept within the cell body. The outer regions of a neuron contain branch-like structures that receive information from adjacent neurons called dendrites a. The centerpiece of a neuron that contains information (DNA) that determines how a neuron will function is called the nucleus b. The cell body of the nucleus that produces neurotransmitter substances and helps protect the vital information contained in the nucleus is called the soma c. What is just outside of the soma that serves as a gatekeeper through determining whether information will proceed down the neuron? Axon hillock d. When the axon hillock allows information to precede, this information then travels down the axon, which is the neural fiber that transmits or sends information form the soma to the other end of a neuron. e. A fatty tissue substance that protects information stored inside the axon and also aids in the speed of the transmission of information is called the myelin sheath i. If myelin breaks down, the electrical impulse within the axon will leak out resulting in information not traveling down the axon. The depletion of myelin, as a result, could lead to? Multiple sclerosis f. Spaces or gaps between sections of myelin that speed up the process of transmission are called nodes of ranvier g. Once information reaches the axon terminal/buttons, the ending part of a neuron, it is sent via release channels into the synapse/ synaptic cleft, the space between axon terminal of one neuron and the dendrites of an adjacent neuron.

2 h. Chemicals that transfer information from one neuron to another and are released into the synaptic cleft or synapse are called neurotransmitters i. An area of the dendrites that accepts neurotransmitters is called the receptor site m. Neurotransmitters that do not quickly bind to an appropriate receptor site are forced to return back to the axon terminal via or through the reuptake centers where they then wait until another signal allows them to reenter the synapse. Types of Neurons 3. What are responsible for the communication of information? Neurons a. Neurons that transmit information form the spinal cord to the brain, and help our brain register sensory information are called afferent (sensory) neurons b. Efferent or motor neurons are responsible for? Transmit information from the brain to muscles and glands i. Your brain is able to identify that your hand is touching something hot via which type of neuron? Sensory neurons ii. Your hand dropping whatever is hot is made possible via which type of a neuron? Motor neuron Neural Communication 4. How one neuron communicates with another neuron is possible through a neural? Neural impulse 5. Negatively charged chloride (CI-) ions exist within the axon, resulting in a negative charge called polarization a. Negatively charged ions wait for stimulation within the axon- the neuron is said to be inactive and is waiting for another action potential. This refers to the resting potential b. When a neuron is stimulated, channels along the axon start to allow positively charged sodium (NA+) and potassium (K+) ions to enter. This then allows the sodium and potassium channels to open allowing the electrochemical process to continue down the axon. This process is called? Depolarization

3 c. A change in the balance of the overall charge of the neuron causes the electrochemical signal to travel or is fired along the axon. This is referred to as a? Action potential d. A point of excitation on the neuron that must be reached for an action potential to occur refers to exceeding the threshold e. After a neuron fires, there is a time period when the neuron recharges itself electrically until it reaches polarization. Until this occurs the neuron can t fire an action potential. This period is referred to as the? Refractory period Neurotransmitters 6. Inside the buttons or knobs at the end of the axon terminals are sacs or vesicles that contain substances known as? Neurotransmitters a. Neurotransmitters are involved in everything from bodily movements to emotions and can be either inhibitory or excitatory: b. If a neurotransmitter carries an inhibitory message then what happens? Discouraging the firing of the receiving neuron c. If a neurotransmitter carries an excitatory message then what occurs? Encouraging the firing of the receiving neuron 7. Explain the functions of each of the following neurotransmitters and discuss when excess of or deficiency of each could result in. Neurotransmitter Function Excess Deficiency Acetylcholine Memory, mood, voluntary muscle movement Convulsions or excess shaking Alzheimer s disease paralysis Dopamine Serotonin GABA Norepinephrine Feelings of euphoria (reward), movement Mood, appetite, impulsiveness Mood, sleep, movement Alertness, sleep, learning Schizophrenia Tremor s, headaches Lethargy Fear, anxiety Glutamate Memory Brain damage due to overstimulation Parkinson s disease Depression, eating disorders, alcoholism, aggression Anxiety disorders, Huntington s disease Depression Neurological disorders

4 1. The part of a neuron that receives information from other neurons is called: *RC: Like the entrance to a water slide* A) Dendrites B) Axon C) Soma D) Axon hillock E) Nucleus 2. The part of a neuron that covers or insulates the axon and speeds up the transmission; when depletes could lead to multiple sclerosis. *RC: Think of the water in a slide that allows you to go faster down the slide* A) Dendrites B) Axon C) Myelin sheath D) Axon hillock E) Synapse 3. The synapse is defined as: *RC: Think of the pool that you have to swim through to get to other side to ride the slide again* A) The aid and support provided to a neuron for suspendibility. B) The receiving part of a neuron. C) The sending part of a neuron. D) The insulation of the axon allowing speedy transmission of a message. E) The gap between two neurons that neurotransmitters cross. 4. Occurs though the process of depolarization when positive energy surpasses the threshold leading to a(n): *RC: Think of crossing the finishing line reaching full speed* A) Synaptic cleft D) Repolarization B) Action potential E) All-or-nonresponse C) Refractory period 5. The inability after an action potential to generate another action potential is referred to as: *RC: Think of trying to flush a toilet right after the water goes down* A) All-or-nonresponse D) Refractory period B) Depolarization E) Synapse transmission C) Repolarization

5 _A 1. The part of a neuron that receives information from other neurons is called: *RC: Like the entrance to a water slide* A) Dendrites B) Axon C) Soma D) Axon hillock E) Nucleus _C 2. The part of a neuron that covers or insulates the axon and speeds up the transmission; when depletes could lead to multiple sclerosis. *RC: Think of the water in a slide that allows you to go faster down the slide* A) Dendrites B) Axon C) Myelin sheath D) Axon hillock E) Synapse _E 3. The synapse is defined as: *RC: Think of the pool that you have to swim through to get to other side to ride the slide again* A) The aid and support provided to a neuron for suspendibility. B) The receiving part of a neuron. C) The sending part of a neuron. D) The insulation of the axon allowing speedy transmission of a message. E) The gap between two neurons that neurotransmitters cross. _B 4. Occurs though the process of depolarization when positive energy surpasses the threshold leading to a(n): *RC: Think of crossing the finishing line reaching full speed* A) Synaptic cleft D) Repolarization B) Action potential E) All-or-nonresponse C) Refractory period _D 5. The inability after an action potential to generate another action potential is referred to as: *RC: Think of trying to flush a toilet right after the water goes down* A) All-or-nonresponse D) Refractory period B) Depolarization E) Synapse transmission C) Repolarization

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