Co-ordination

Question 1

Define sensitivity

Answer 1

Ability to respond to a stimuli

Question 2

Give the details of Nervous Coordination

Answer 2

-Central Nervous System> Brain & Spinal Cord
-Peripheral Nervous System> Nerves

Question 3

State the 5 components of coordination system

Answer 3

-Stimuli
-Effectors
-Coordinators
-Receptors
-Response

Question 4

What are the two types of actions?

Answer 4

Voluntary & Involuntary

Question 5

Define ‘Nerve Impulses’

Answer 5

Nerve Impulses are the electrochemical signals/waves that transmit or carry messages in nerves

Question 6

What is the Axon?

Answer 6

Its a one way fiber that transmits impulses away from cell body

Question 7

What do dendrons do?

Answer 7

They transmit/conduct impulses towards cell body and have branches/terminals called dendrites

Question 8

State a few points on Myelin Sheath

Answer 8

-Encloses nerve fiber
-Fatty
-Insulating

Question 9

State a few points on Neurilemma

Answer 9

-Covers myelin sheath
-Provides nourishment to nerve fiber
-Not continuous

Question 10

State a few points on the Nodes of Ranvier

Answer 10

-Its where the neurilemma sinks down
-Myelin sheath is not continuous but separated at intervals which are called the Nodes of Ranvier
-Speed up transmission of impulse along the fiber

Question 11

State the types of neurons and what they do

Answer 11

-Sensory neuron/ Receptor neuron> Sends questions
-Relay or intermediate neuron> Makes answer
-Motor or Effector neuron> Sends back answer

Question 12

Add on those 3 neurons

Answer 12

Sensory/Receptor: Transmit impulses from sense organ to CNS
Relay/Intermediate: Transmit impulses from CNS to effector
Motor/Effector: Found within the central nervous system

Question 13

Give details about a Synapse

Answer 13

-An impulse stimulates the release of neuro-transmitter molecules from vesicles into the synaptic gap
-The neurotransmitter molecules diffuse across the gap and bind with receptor protein
-An impulse is stimulated in the next neuron
-Impulse travels in one direction only

Question 14

State a few points about the Spinal Cord

Answer 14

-Enclosed in vertebral column
-31 pairs of spinal nerves
-Consist of grey and white matter
-Narrow canal with CSF runs in the middle of S.C
-Provides nutrients to S.C
-Spinal Nerves> Dorsal and Ventral root

Question 15

State a few points about the Dorsal Root

Answer 15

-Joins the dorsal part of the spinal cord
-Contains only sensory neurons
-Cell bodies aggregate in a small swelling known as dorsal root ganglion
-Axons end in grey matter of spinal cord

Question 16

State a few points about the Ventral root

Answer 16

-Attached to ventral part of spinal cord
-Contains motor neurons
-Cell bodies lie in grey matter of spinal cord
-Axons leave spinal cord and enter into the ventral root and spinal nerve

Question 17

Suggest a few points about reflexes

Answer 17

-Contains both receptor/effector nerves
-While leaving spinal cord, spinal nerve sub divides into body parts
-Motor goes to effector
-Sensory goes to receptor

Question 18

What do relay/intermediate neurons do?

Answer 18

They live in grey matter and form synapses