the nervous system

Question 1

def the nervous system

Answer 1

a network of specialised cells that coordinate the actions of an organism and transmit electrical signals btw all parts of the body

Question 2

def reflex actions

Answer 2

an immediate response to a specific stimulus without conscious control

Question 3

def reflex arc

Answer 3

shortest pathway in which nervous impulses travel from the receptor to the effector in a reflex action

Question 4

voluntary vs reflex actions (6)

Answer 4

• under conscious control of will vs not
• may/may not involve stimulus vs involves stimulus
• may/may not be immediate vs immediate response
• impulses produced by brain vs sensory neurones
• involves brain in decision making vs does not
• does not travel in reflex arc vs does

Question 5

eg of reflex arc (heat)

Answer 5

1. heat from [ ] was the stimulus that stimulated the heat receptors in [ ]
2. nerve impulses would be generated and be carried by the sensory neurone until it reaches the nerve ending
3. the nerve impulse would be passed over a synapse to a relay neurone in the cns
4. the relay neurone would then pass the impulse to an outgoing motor neurone across another synapse
5. the motor neurone would bring the impulse to the motor end plates in the effectors
6. the muscles in the [ ] would then contract to cause the entire [ ] to move away from the heat source