Reflex Action

Lesson 3 - Reflex Arc

Multiple Choice

Some of your responses to stimuli are so fast that they happen without giving you much time to think. Automatic responses like these are known as

• Reflexes

• Automatic

• Stimulus

• CNS

Why do you think it is important for animals and humans to have reflex actions?

Can you think of any examples?

Reflexes are:

• Automatic – they do not involve the conscious part of the brain

• Rapid

• Helps us to avoid danger and increase survival chances.

Multiple Choice

A is the

• nucleus

• insulating sheath

• synapse

• effector

Multiple Choice

B is the

• Insulating Sheath

• effector

• CNS

• Nerve fibre

Multiple Choice

C is the

• effector

• synapse

• CNS

• Insulation layer

Multiple Choice

D is the

• Insulation layer

• CNS

• Nucleus

• neurone

Multiple Choice

Fatty depositis on nerve cells...

• stop the electrical impulse from leaking away.

• allow the electrical impulse to leak away.

• Are branched to connect to other synapses

Multiple Choice

Specialised nerve cells are called?

• Neurones

• neural pathway

• CNS

• The brain

Multiple Choice

Gaps between neurons are called...

• Synapses

• Synopsis

• Sensory

• Motor

Poll

Sensory neurons

• transmits impulses from a receptor to the CNS (Spinal cord/brain)

• transmit impulses from the spinal cord to the effectors (skeletal and smooth muscles)

• found in the CNS - carry the electrical impulse from sensory to motor neuron

Poll

Motor neurons

• transmits impulses from a receptor to the CNS (Spinal cord/brain)

• transmit impulses from the spinal cord to the effectors (skeletal and smooth muscles)

• found in the CNS - carry the electrical impulse from sensory to motor neuron

Poll

Relay neurons

• transmits impulses from a receptor to the CNS (Spinal cord/brain)

• transmit impulses from the spinal cord to the effectors (skeletal and smooth muscles)

• found in the CNS - carry the electrical impulse from sensory to motor neuron

Complete activity 1 on Showbie

Answer in your books

EXIT QUIZ

Multiple Select

Select two examples of effectors.

• Neuron

• Gland

• Muscle

• Receptor

Multiple Choice

Which type of neuron causes a muscle to contract in a reflex arc?

• Motor Neuron

• Sensory Neuron

• Interneuron

• Effector

Multiple Choice

Reflex actions are important because

• They provide a quick, involuntary response

• They prevent injury

• They are essential to the survival of organisms

• All of the above

Multiple Choice

In a reflex arc, the sensory neuron leads to the ___________ and the motor neuron leads to the __________

• Spinal cord, CNS

• CNS, muscle

• Spinal cord, muscle

• Muscle, CNS

Multiple Choice

An example of a reflex action includes

• Touching a butterfly

• Brushing your hand against the side of your body

• Touching a hot stove

• Your legs moving as you walk

Multiple Choice

Name an effector in this diagram.

• A

• B

• D

• E

• F

Multiple Choice

What type of neuron is C?

• Sensory

• Inter

• Motor

Multiple Choice

What type of neuron is B?

• Sensory

• Inter

• Motor

Multiple Choice

What type of neuron is A?

• Sensory

• Inter

• Motor