Relfex Arc And Neurons

Question 1

What does each neurons cell body contain

Answer 1

Nucleus

Question 2

What does each neuron have

Answer 2

• cell body containing nucleus
• an axon and dendrites - run the length of neuron, how information carried across the body

Question 3

What’s at the end of an axon

Answer 3

Axon terminal - almost touches dendrite of next neuron (synapse)

Question 4

What’s the myelin sheath

Answer 4

• made of Schwann cells
• protects cell and helps increase speed of electrical information transmission along axon

Question 5

What’s at the end of a motor neurone

Answer 5

Effector (muscle or gland) which is activated by the motor neuron

Question 6

What is the process of a Reflex Arc

Answer 6

1. Sensation detected by sensory receptors of sensory neurons
2. Electrical signal travels along dendrite to axon terminal
3. Converts to chemical signal and crosses synaptic cleft, detected by relay neuron in the spine
4. Reflex response passed immediately to motor neuron and also from relay neuron to CNS for processing
5. Signal travels along motor neuron to the effector which causes limb to move out of danger