B10 - The Human Nervous System

Question 1

D. Homeostasis

Answer 1

The regulation of internal conditions of a cell or organism to maintain optimum conditions for function, in response to internal and external changes.

Question 2

D. Receptors

Answer 2

Cells that detect change in the internal and external environment.

Question 3

D. Coordination centres

Answer 3

Areas that recieve and process the information from receptors and send our signals to coordinate the response of the body. (Inc. brain, pancreas…)

Question 4

D. Effectors

Answer 4

Muscles or glands that bring about responses to the stimulus that has been received. These responses restore conditions in the body to optimum levels.

Question 5

3 examples of internal conditions?

Answer 5

• body temp
• water content of the body
• blood glucose concentration

Question 6

D. Neurons

Answer 6

Special cells that pass an electrical impulse with information in along them.

Question 7

D. Nerves

Answer 7

Bundles of hundreds/ thousands of neurons

Question 8

CNS stands for?

Answer 8

Central nervous system

Question 9

CNS made up of?

Answer 9

Brain and the spinal cord

Question 10

D. Sensory neurons

Answer 10

Cells that carry electrical impulses from your sense organs to CNS

Question 11

D. Motor neurons

Answer 11

Cells that carry information from CNS to rest of body

Question 12

Nervous system summed up by

Answer 12

stimulus>receptor>coordinator(CNS)> effector

Question 13

D. Stimuli

Answer 13

Changes in the environment

Question 14

D.Reflexes

Answer 14

Automatic responses

eg: touch something hot and pull hand away

Question 15

D. Synapses

Answer 15

Physical gaps between the neurons.

Electrical impulse turn into chemical impulses to cross the synapses

Question 16

Reflex Arc process?

Answer 16

Stimulus>Receptor>Sensory neurone>Relay neurone>Motor receptor>effector>response

Question 17

Function of myelin sheath?

Answer 17

Insulation increases speed of impulse