Nerve impulses

Which type of neurones send action potentials from sensory receptors to the CNS?

• Sensory

• Motor

• Relay

• intermediate

Which type of neurones send action potentials from the CNS to effectors?

• Sensory

• Motor

• Relay

• Intermediate

You are watching TV and your friend changes the channel. What is the stimulus?

• The programme on TV

• Changing the channel

• The receptors in the retina

• The receptors in the ears

A ball is passed to you and you kick it to someone else. What are the effectors in this example?

• Rod & cone cells in the eyes

• The brain

• The muscles in the legs

Which of the following does not form part of a reflex arc?

• Sensory neurone

• Motor neurone

• Relay neurone

• Brain

Which of the following is not true of a reflex?

• They protect us from harm

• They are rapid

• They are innate

• They are under conscious control

What does the sodium/potassium pump do?

• Pumps 3 Na⁺ out for every 2 K⁺ pumped in

• Pumps 3 Na⁺ in for every 2 K+ pumped out

• Pumps 2 Na⁺ out for every 3 K⁺ pumped in

• Pumps 2 Na⁺ in for every 3 K⁺ pumped out

Which term is defined as '​​an uneven distribution of electrical charge across a plasma membrane'?

• Resting potential

• Action potential

• Potential difference

• Depolarisation

• Repolarisation

Which term is defined as 'a brief reversal of the potential difference across the membrane of a neurone'?

• Resting potential

• Action potential

• Depolarisation

• Repolarisation

At rest, the outside of a neurone is less positive than the inside of a neurone. True or false?

• True

• False