Nervous System U7

Question 1

Central Nervous System; Peripheral Nervous System

Answer 1

• Brain and Spinal Cord

- Peripheral Nerves link CNS with receptors and effectors

Question 2

Dendrites; Cell Body; Axons; Myelin Sheath

Answer 2

conduct nerve impulse towards cell body
replays impulse from dendrite to axon
conduct impulse from cell body
Protective coating of Schwann Cells around larger axon and dendrites

Question 3

Nodes of Ranvier; Motor end plates; Ganglia

Answer 3

interrupted areas with the myelin sheath (not coated)
impulse chemically transported to muscles/organs
collection of cell body out of CNS

Question 4

Sensory Neuron; Interneuron; Motor neuron

Answer 4

• Conduct nerve impulse from receptors to CNS
• Relay impulse from SN to motor neuron (makes up brain and spinal cord)
• conduct impulse from CNS to effectors

Question 5

Stimulus Response Pathway

Answer 5

Stimulus - receptor - (Sensory Neuron( CNS - (Relay neuron) CNS - (Motor Neuron) Effector - response

Question 6

Resting Potential; Action Potential; Depolarization; Repolarization

Answer 6

• Not firing (-70mV) negative
• Firing (30mV) positive
• Change in membrane polarity while firing
• Restoration of resting potential

Question 7

Repolarization

Answer 7

Sodium(Na+)Potassium(K+) Pump maintains electrochemical gradient of resting potential
Transmembrane protein uses active transport
expels 3Na+ for every 2K+ emmited

Question 8

Reflex

Answer 8

Rapid involuntary response to stimulus from simpler pathway (reflex arc)
No brain involved

Question 9

Reflex Arc

Answer 9

Stimulus initaites receptor - sensory carries to interneuron - Interneuron carries to motor neuron - motor neuron carries to effector
brain finds out later

Question 10

Spinal Cord

Answer 10

Central canal - cerebrospinal fluid
Grey matter - cell bodies
white matter - long fibers of interneurons
Dorsal (Back) carries info to brain Ventral (front) carries info from brain
Left side of brain controls right side Vice Versa

Question 11

Medulla Oblongata; Cerebellum

Answer 11

• Brain Stem; pathway brain and spine;

- Butterfly shape; rear lower portion of brain; second largest

Question 12

Hypothalamus; Thalamus

Answer 12

• Just above the pituitary gland; maintains homeostasis

- Above thalamus; prevents sensory overload; channels info to appropriate place

Question 13

Cerebrum; Corpus Callosum

Answer 13

• largest part of brain; 2 hemispheres (Left and right); Frontal lobe, Temporal Lobe; Parietal Lobe; Occipital lobe
• Holds hemispheres together; Conducts impulses from one side to the other

Question 14

Frontal Lobe; Temporal Lobe

Answer 14

• Emotional Control Center; Home for personailty; Reasoning, planing, speech, movement
• Memory; interpreting sound and langauge

Question 15

Parietal Lobe; Occipital Lobe

Answer 15

• Middle; processing body senses; pressure. touch, pain

- Back of brain; visual info and stimuli

Question 16

Somatic; Autonomic

Answer 16

• Voluntary; skeletal muscle, joints, skin; receive and act on stimuli
• control smooth muscle of internal organs and glands; without conscious control; Sympathetic and Parsympathetic have 2 motor neurons with ganglion between