Reflex Arc and Reflex Action

In a reflex action, the __________ bypasses the ___________

• Motor neuron, brain

• Sensory neuron, brain

• Sensory neuron, spinal cord

• Motor neuron, spinal cord

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

Tags

NGSS.MS-LS1-8

An effector is also known as a ____________ to an action

• Stimulus

• Sensory neuron

• Motor neuron

• Response

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

When you suddenly shine a torch in someone's eye, the pupil

• Contracts, then stays that way for the rest of the day because the pupil needs time to readjust

• Stays the same

• Dilates

• Contracts

Tags

NGSS.HS-LS1-3

Conditioned reflexes involve

• An immediate response because your body should know how to respond to something by itself

• An on the spot reaction that doesn't involve prior knowledge

• Prior thought or learning

• A slow response to an object moving

What happens in the spinal cord during a reflex arc?

• The stimulus causes a sensory neuron to generate a nerve impulse

• The nerve impulse carries a signal to be directly sent to a sensory neuron

• The motor neuron causes a contraction

• The nerve impulse carries a signal to be directly sent to a motor neuron

If you pick up a hot plate _____________ receptors in your ___________ detect this change

• Sensory, skin

• Sensory, muscle

• Motor, skin

• Intermediate, muscle

Tags

NGSS.MS-LS1-8

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

What are papillae?

• Very small structures where taste buds are contained

• Very small structures that hold neurons

• Very small structures that contain nerve impulses

• Very small structures that contain nerve cells ready to fire when an action is performed