Worksheet: Reflex Actions

In this worksheet, we will practice describing the structure of the reflex arc, and explaining the advantages of having reflex actions.

Q1:

Which of the following shows the correct process of a reflex arc?

  • AReceptor, stimulus, relay neuron, sensory neuron, motor neuron, effector, response
  • BStimulus, receptor, sensory neuron, relay neuron, motor neuron, effector, response
  • CStimulus, receptor, motor neuron, relay neuron, sensory neuron, effector, response
  • DReceptor, stimulus, sensory neuron, relay neuron, motor neuron, effector, response
  • EStimulus, receptor, sensory neuron, relay neuron, motor neuron, response, effector

Q2:

You spot a football flying towards your face in a park. Without thinking, you duck.

In this reflex action, what is the response?

  • ADucking
  • BThe football
  • CRunning
  • DThe muscles in your body

In this reflex action, what is the receptor?

  • APressure receptors in the skin
  • BSound receptors in the skin
  • CSound receptors in the ears
  • DLight receptors in the eyes

Q3:

A bright light is pointed into your eye. Your pupil contracts to restrict the light entering.

In this reflex action, what is the effector?

  • AThe light
  • BYour eyelids
  • CThe muscles around the pupil
  • DThe eye

In this reflex action, what is the response?

  • AThe pupil contracting
  • BLight receptors in eyes
  • CBlinking
  • DThe muscles around the pupil

Q4:

You are planning an investigation to measure reflex-reaction times. The method is outlined below:

  1. Hold a ruler above your partner’s hand.
  2. Drop the ruler.
  3. Measure at what distance (in centimeters) your partner caught the ruler.
  4. Repeat at different times of the day.

In this investigation, what is the independent variable?

  • AThe ruler
  • BThe person
  • CTime of day
  • DThe distance the ruler is dropped from
  • EThe distance the ruler is caught at (in centimeters)

In this investigation, what is the dependent variable?

  • AThe ruler
  • BThe person
  • CThe distance the ruler is dropped from
  • DThe distance the ruler is caught at (in centimeters)
  • ETime of day

Which of the following describes a way to make this study more accurate?

  • AUsing a different ruler every time so reaction time with different rulers can be measured
  • BChanging the person catching the ruler each time
  • CChanging the person dropping the ruler each time
  • DRepeating the study three times and calculating the average reaction time for each time of day
  • ERepeating the study three times and determining the median reaction time

Q5:

You are in a building when someone shouts, “fire!” Without thinking, you start running.

In this reflex action, what is the stimulus?

  • APeople running
  • BThe shout of “fire”
  • CThe muscles in your legs
  • DThe fire

In this reflex action, what is the effector?

  • AShouting
  • BThe muscles in your leg
  • CRunning
  • DSound receptors in your ears

Q6:

For the following situations, choose the receptor that would most likely detect each stimulus.

A loud crash makes you jump.

  • ALight receptors in the eyes
  • BLight receptors in the brain
  • CSound receptors in the ears
  • DSound receptors in the skin
  • EPain receptors in the skin

You hold your hand over a kettle and feel that it is warm.

  • AHeat receptors in the muscle
  • BHeat receptors in the skin
  • CPain receptors in the muscle
  • DPressure receptors in the skin
  • EPain receptors in the skin

You feel a sharp pinch in your arm as you are having an injection.

  • APressure receptors in the muscle
  • BPain receptors in the muscle
  • CPressure receptors in the skin
  • DPain receptors in the skin
  • EHeat receptors in the skin

You see a bright light flash in the distance.

  • ALight receptors in the eyes
  • BPressure receptors in the eyes
  • CHeat receptors in the skin
  • DSound receptors in the ears

Q7:

Why is it beneficial that reflex actions do not require thinking?

  • ASignals are passed to the brain, allowing the body to respond more quickly.
  • BSignals are not passed to the brain, allowing the body to respond slowly.
  • CSignals bypass the entire central nervous system, so reactions are very quick.
  • DSignals are not passed to the brain, allowing the body to respond more quickly.
  • ESignals bypass the entire central nervous system, so reactions are very slow.

Q8:

Which of the following is not an advantage of having reflex actions?

  • AReflex actions do not require the brain to think about responses before acting.
  • BReflex actions take care of basic bodily functions like breathing and heart rate.
  • CReflex actions allow a quick response to danger.
  • DReflex actions prevent a person from feeling pain.
  • EReflex actions are involuntary.

Q9:

You reach over an oven and accidentally touch a hot baking tray. You immediately pull your arm away.

In this reflex action, what is the stimulus?

  • AThe muscles in your arm
  • BThe movement of your arm
  • CThe oven
  • DThe hot baking tray

In this reflex action, what is the receptor?

  • APressure receptors in the brain
  • BPain receptors in the skin
  • CPressure receptors in the skin
  • DPain receptors in the brain

In this reflex action, what is the effector?

  • AThe muscles in your arm
  • BThe movement of your arm
  • CThe hot baking tray
  • DYour skin

In this reflex action, what is the response?

  • AThe hot baking tray
  • BThe movement of your arm
  • CThe movement of your legs
  • DThe muscles in your arm

Q10:

Which of the following best describes the role of receptors in the human body?

  • AThey transmit signals across the central nervous system.
  • BThey detect changes in the external environment.
  • CThey release hormones.
  • DThey bring about a response.
  • EThey transmit electrical impulses across synapses.

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