Reflex Arc Flashcards

1️⃣ Familiarise yourself with the flashcards:

  • Look through all the flashcards to see what’s on both sides.
  • Make sure you understand the information on each card. If something’s unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

  • Look at the question or prompt on each card and try to remember the answer before flipping it over.
  • Check the answer and make a note of any cards you find challenging and need to go over more.

3️⃣ Consistently Review and Practice:

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  • Regularly review all the flashcards to help you better understand and retain the information over time.

Note: We may include questions that have multiple correct answers. It’s useful to remember specific examples to understand these concepts better.

What are the three main types of neurones?

Sensory neurones – Carry electrical impulses from the receptors to the CNS.

Relay neurones – Connect the sensory and motor neurones.

Motor neurones – Carry information from the CNS to the effectors.

What is a reflex action and why is it important?

A reflex action is a rapid, automatic response to a specific stimulus, preventing injury by not involving the conscious part of the brain.

Describe the path of a reflex arc.

1. Receptor detects a stimulus and sends information to the sensory neurone.

2. Impulse travels to CNS.

3. CNS determines a response

4. CNS sends impulse via motor neurone to an effector.

5. Effector (muscle) contracts.

Explain the reflex action when a bird spots a cat.

1. The bird’s eyes (receptors) detect the cat.

2. Sensory neurones send info to CNS.

3. CNS determines the response.

4. Motor neurones send info to the bird’s wings (effectors).

5. Bird’s wing muscles contract to fly away.

What are synapses and how do they work?

Synapses are gaps between neurones.

Electrical impulses trigger the release of neurotransmitters, which diffuse across the synapse and bind to receptors on the next neurone, transmitting the impulse.

Outline the steps in neurotransmitter diffusion at a synapse.

1. Impulse travels along the first neurone’s axon.

2. Reaches end, releasing neurotransmitters.

3. Neurotransmitters diffuse across synapse.

4. Neurotransmitters bind to receptors on the second neurone.

5. This binding triggers an electrical impulse in the second neurone.

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