Neurons
Myelin is defined as...
A lipid layer that encases the axons of some neurons in the CNS/PNS
Which neuroglial cell PRODUCES MYELIN in the CNS?
Oligodendrocytes
What are the two parts of the CNS?
Brain and spinal cord
Which neuroglial cells are ONLY found in the PNS?
Schwann cells Satellite cells
Three general functions of the nervous system are...
1. Sensory 2. Integrative 3. Motor
The extensions that provide the main RECEPTIVE surfaces for neurons are
dendrites
Name the six types of neuroglial cells?
Astrocytes Ependyma Microglia Oligodendrocytes Schwann cells Satellite cells
Most of the neurons in the brain and spinal cord are uni/bi/multipolar?
multipolar
The myelin sheath in the PNS is made up of what type of material?
lipids/fats
What is the function of the motor portion of the nervous system?
Effectors: Controls the movement of muscles and secretions of glands -reacts
The process of transmitting a nerve impulse from one neuron TO ANOTHER involves what? Hint: How does a neuron send a signal to the next neuron starting with the action potential/nerve impulse (4 key words)
An ACTION POTENTIAL stimulates the AXON TERMINAL to release NEUROTRANMITTERS into the SYNAPSE
Which neuroglial cells are like "housekeepers" cleaning up cellular debris and phagocytizing bacterial cells?
Microglia
DAILY DOUBLE: Bonus-- not on test Which TYPE of neuron is found ONLY in the CNS
interneurons
Skeletal muscle contraction is under the control of which extra division of the PNS?
Somatic N. S.
What is the function of the integrative portion of the nervous system?
Integrates (combines) information from several sources and uses it to make an appropriate response
The signals are brought together creating sensations, adding to memory, and producing thoughts
Unlike the majority of other cells, mature neurons do not...
multiply/ divide/ regenerate
Which types of neuroglial cells are found in the CNS?
Astrocyte Oligodendrocyte Ependymal Cell Micoglial cells
Name the 4 major signs of addiction
Cravings/ Loss of control/Tolerance/Continued use despite negative consequences
Schwann cells are found only in the ____________ and are composed of layers of ______________
PNS/ Myelin
What is the function of the sensory portion of the nervous system?
Detects changes in internal/external environment -gathers info
Draw and label a neuron. Label: dendrites, axon, myelin sheath, cell body with nucleus, axon terminal, and nodes of Ranvier
Answers will vary
Draw a unipolar- bipolar- and mutipolor neuron. Make sure to say which one is which!
Answers will vary
Explain the 4 major signs of depression
Cravings- psychological NEED for the substance
Loss of control- Cannot just stop at 1
Tolerance- Need more of the drug to get the wanted effect
Continued use despite consequences- will use no matter the damage to family, work, personal life...
Which type of muscle tissues is under voluntary control of the nervous system?
Skeletal muscle
List the three types of neurons AND their accessory structures in the correct sequence. ______--->_______--->______--->______--->______
=
Receptor, sensory neuron, interneuron, motor neuron, effector