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Flashcards in Nervous Systems (8.9) Deck (21):
1

The Evolution of a Nervous System started with the evolution of an organism wide _______ ____ in Cnidarians.

Nerve Net

2

The evolution of a _____ (a mass of neurons) leads to control of the system. It uses a nerve cord to control the body.

brain

3

The evolution of other sensory organs in the head region, called __________, allows for reception and response to
stimuli from the environment.

cephalization

4

Stimulus sent into the brain or spinal cord.

Sensory input

5

Sensory Receptors receive a _______ from the environment.

stimulus

6

a form of energy such as electromagnetic (light), mechanical (pressure), and sound waves.

stimulus

7

This is the interpretation of the energy by the Central Nervous System (CNS). (Basically “thinking” about the stimulus. ) This interpretation of the stimulus leads to a determination of the appropriate response.

Integration

8

Out of the brain or spinal cord. The response is carried out by Effector Cells. Effectors are Muscles or Glands. (These can have an effect on your body.)

Motor Output

9

This includes the Sensory receptors and Motor Nerves

Peripheral Nervous System

10

This takes stimuli from different dendrites and compiles the energy into one signal. (Like a funnel.)

cell body

11

These collect and carry stimuli Energy in to the cell body. (They cover a large area.)

Dendrites

12

This one arm carries the one compiled signal away toward the next neuron or effector cell.

Axon

13

This is a lipid layer of insulation around the axon created by Schwann Cells. It prevents the electrical energy of the neuron from burning the overlying muscle tissue. (It is analogous to the rubber covering on electrical wires.)

Myelin Sheath

14

This is the gap between neurons or between a neuron and an effector cell.

synapse

15

This is the chemical, produced by the neuron, used to transmit the signal across the gap.

neurotransmitter

16

The most common neurotransmitter is ____________.

Acetylcholine

17

The simplest neural pathway.

Reflex Arc

18

A stimulus energy is detected by a _____ ______. (Carries the energy signal to the spinal cord.)

sensory neuron

19

An _______ (of the CNS – spinal cord) relays the energy back out to the motor nerve instead of to the brain.)

interneuron

20

The energy is carried out of the CNS by the ______ ______. It carries the energy to an effector cell, usually a muscle.

Motor Neuron

21

This is why you do not think about a reflex, it just happens. The stimulus never made it to the brain for _________.

integration