The Nervous System (chapter 34)

Question 1

CNS consists of…

Answer 1

The Central Nervous System consists of the brain and spinal cord

Question 2

PNS consists of …

Answer 2

The Peripheral Nervous System consists of a vast network of nerves that carry messages between the CNS and the rest of the body

Question 3

Four processes in order to make the correct response to a stimulus.

Answer 3

1. Reception (detecting the stimulus)
2. Transmission (neurons in PNS carry messages from receptors to the CNS and from the CNS to effectors, such as muscles)
3. Integration (incoming messages are sorted and processed and a response is decided upon. occurs in CNS)
4. Response (this is carried out by the effectors when they are stimulated by neurons)

Question 4

Neuron

Answer 4

A neuron is a nerve cell

Question 5

Threshold

Answer 5

The threshold is the minimum stimulus needed to cause an impulse to be carried.

Question 6

All or nothing law

Answer 6

The all or nothing law states that if the threshold is reached an impulse is carried, but if the threshold is not reached no impulse is carried.

Question 7

refractory period

Answer 7

The refractory period is a short timespan after a neuron has carried an impulse during which a stimulus fails to cause a response.

Question 8

synapse

Answer 8

A synapse is a region where two neurons come into close contact

Question 9

synaptic cleft

Answer 9

A synaptic cleft is the tiny gap between the two neurons at a synapse

Question 10

reflex action

Answer 10

A reflex action is an automatic, involuntary, unthinking response to a stimulus.