Chapter 10

Question 1

Homeostasis

Answer 1

Regulating internal conditions to keep them at an optimum, despite changes - for enzymes.

Question 2

Negative feedback

Answer 2

Changes are reversed and returned back to the optimum level.

Question 3

Central Nervous System (CNS)

Answer 3

Brain and Spinal cord. Coordinates response of effectors.

Question 4

Reflex action

Answer 4

Fast, automatic reaction.

Question 5

Coordination centre

Answer 5

Receives and processes information.

Question 6

Synapse

Answer 6

The gap between two neurons.

Question 7

THE REFLEX ARC

Answer 7

Stimulus - Receptor - Sensory neuron - Relay neuron - Motor neuron - Effector - Response.

Question 8

THE REFLEX ARC -

1) STIMULUS

Answer 8

Change in the environment

Question 9

THE REFLEX ARC -

2) RECEPTOR

Answer 9

Detects a stimulus

Question 10

THE REFLEX ARC -

3) SENSORY NEURON

Answer 10

Transmits to the CNS

Question 11

THE REFLEX ARC -

4) RELAY NEURON

Answer 11

Spinal cord

From the sensory to the motor neuron

Question 12

THE REFLEX ARC -

5) MOTOR NEURON

Answer 12

From CNS to effector

Question 13

THE REFLEX ARC -

6) EFFECTOR

Answer 13

Muscle or gland response

Question 14

THE REFLEX ARC -

7) RESPONSE

Answer 14

Change in response to the stimulus.

Question 15

The Synapse

Answer 15

An electrical impulse arrives at Synapse.
Neurotransmitter molecules are released and diffuse across Synapse.
Neurotransmitter molecules fill receptors. Cause an electrical impulse in the next neuron.