Ch 3 - The Nervous System

Question 1

Nervous System

Answer 1

Electrochemical

Question 2

Neurons

Answer 2

Bundles of Nerves

• Work electrically
• Electrical signals around the body
• Connected by synapses, chemical signals
• Whole system is electrochemical

Question 3

Action Potential

Answer 3

Potential difference between synapses and nerves

Question 4

Peripheral Nervous System (PNS)

Answer 4

Pass info from sensory inputs to CNS

• Sensory Nerves (parts of the body -> CNS)
• Motor Nerves - Reflexes (quick) Body-> Brain -> Body via Motor Nerves -> reflex (very quick)

5 Senses:

• Sight
• Touch (biggest)
• Smell
• Hearing
• Taste (also big)

Question 5

Sensory Threshold

Answer 5

Stimuli must be a certain strength for sensory receptors to pick up and acknowledge the stimulus

Increased Threshold - Decreased Sensitivity

Question 6

Absolute Threshold

Answer 6

Threshold at which a receptor will act to a stimulus

Question 7

Just Noticeable Difference (JND)

Answer 7

An increase or a decrease in a stimulus before we notice a change

Question 8

Proprioceptors

Answer 8

Monitor the position, accelerations, movements of the body, velocities

Question 9

Central Nervous System (CNS)

Answer 9

Made up of Brain and Spinal Chord

Analyses and perceives all information from the senses - Pain, temp, accelerations

Question 10

Habituation

Answer 10

Our senses get better to compensate or adapt for other senses

Question 11

% of Information That Comes through Visual Preceptors

Answer 11

70%

Question 12

Autonomic Nervous Systems (ANS)

- Also known as Vegetative or Autonomous

Answer 12

Responsible for involuntary activity such as: HR, BR, Body Temp., BP

• General adaption syndrome - How we respond/act to stress (fight or flight)
• Responsible for Homeostasis - Highly self regulating