Excretion and Homeostasis

Question 1

What are the parts of the CNS

Answer 1

Brain and spinal Cord

Question 2

What are the parts of PNS

Answer 2

Every neurone except those in the brain and spinal cord

Question 3

What are receptors?

Answer 3

Cells or groups of cells that detect stimuli

Question 4

What are effectors?

Answer 4

Parts of the body that respond to a stimulus. (Muscles and glands)

Question 5

What is a nerve?

Answer 5

A group of neurone axons lying together

Question 6

What does a motor neurone cell body contain?

Answer 6

dendrite (little sticks)
cell membrane
cytoplasm
nucleus
ribosome
mitochondria

Question 7

What are the other parts of a motor neurone?

Answer 7

axon (the tube)
myelin sheath (coating)
nucleus of myelin sheath (myelin sheath is a cell too)
nerve ending (axon splits into several endings)

Question 8

What is a nerve impulse?

Answer 8

An electrical signal that passes rapidly along an axon.

Question 9

What is a sensory neurone?

Answer 9

A neurone that transmits impulses from a receptor to the CNS

Question 10

What is a motor neurone?

Answer 10

A neurone that transmits impulses from the CNS to effector cells.

Question 11

What is a relay neurone?

Answer 11

A neurone that transmits impulses within the CNS

Question 12

What is a reflex?

Answer 12

An automatic and rapid response by the body to a stimulus.

Question 13

What is a synaptic gap?

Answer 13

A tiny gap between two neurones at the synapse (junction between 2 neurones)

Question 14

What happens when an electrical impulse travels from one neurone to another?

Answer 14

1. Vesicle containing neurotransmitter molecules reaches end of neurone
2. Neurotransmitter molecules diffuse across narrow gap
3. Receptor proteins of other neurone receive the neurotransmitters.

Question 15

What is the relationship between the shapes of a neurotransmitter and a receptor protein?

Answer 15

Complementary

Question 16

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Answer 16

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