Here is the step-by-step solution to complete your worksheet.
Diagram Labels
To fill in the blank boxes on the diagram, we need to follow the path of the nerve signal from the finger to the muscle and back. The signal travels in a specific loop called the Reflex Arc.
1.
Top Left Box (on the nerve coming from the finger): This nerve carries the signal *to* the spinal cord. It is called the
Sensory Neuron.
2.
Top Right Box (inside the spinal cord): This is where the signal switches from the sensory neuron to the motor neuron. This connector is called the
Relay Neuron (or Interneuron).
3.
Bottom Middle Box (on the nerve going to the muscle): This nerve carries the command *away* from the spinal cord to the muscle. It is called the
Motor Neuron.
4.
Bottom Right Box (pointing to the arm muscle): This is the part of the body that actually moves. It is called the
Effector.
*(Note: There is a small box pointing to the center of the butterfly shape in the spinal cord. If you need to label that specifically, it is the
Spinal Cord or
Central Nervous System, but "Spinal Cord" is already labeled at the top.)*
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Written Questions
1. Define the term 'sensitivity'
*
Reasoning: In biology, sensitivity (also called irritability) is one of the key characteristics of living things. It refers to the ability to detect changes in the environment (stimuli) and react to them.
*
Answer: Sensitivity is the ability of an organism to detect and respond to changes in its internal or external environment (stimuli).
2. How is this type of response different from a voluntary response?
*
Reasoning: A reflex happens automatically without you thinking about it. A voluntary response, like raising your hand, requires your brain to process information and make a decision.
*
Answer: A reflex response is
involuntary and automatic; it happens without conscious thought and does not involve the brain for processing. A voluntary response is under conscious control and requires the brain to think and decide before acting.
3. Explain the advantage of having a reflex response.
*
Reasoning: Why do we have these? Imagine touching a hot stove. If you had to wait for the signal to go to your brain, think "ouch," and then send a signal back, you would get burned badly. Reflexes skip the brain to save time.
*
Answer: The main advantage is
speed. Because the signal does not have to travel all the way to the brain to be processed, the reaction happens almost instantly. This protects the body from harm or injury (like pulling your hand away from something hot before you even feel the pain).
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Final Answer:
Diagram Labels:
* Top Left Box:
Sensory Neuron
* Top Right Box:
Relay Neuron
* Bottom Middle Box:
Motor Neuron
* Bottom Right Box:
Effector
Worksheet Questions:
1.
Sensitivity: The ability to detect and respond to stimuli (changes in the environment).
2.
Difference: Reflexes are involuntary and automatic (do not involve the brain), whereas voluntary responses are conscious decisions controlled by the brain.
3.
Advantage: They are very fast, which helps protect the body from damage or injury by reacting immediately.
Parent Tip: Review the logic above to help your child master the concept of reflex arc worksheet.
