Science Worksheet
Grade 8:Human Nervous System
1. Ali touches a hot pan and immediately pulls his hand away. Which type of response is this?
A) Voluntary action
B) Reflex action
C) Learned action
2. Sara smells freshly baked bread and feels hungry. Which structure first detects the smell?
A) Sensory receptors
B) Motor neurons
C) Spinal cord
D) Muscles
3. Ahmed is playing football and decides to kick the ball. Which part of the nervous system controls this voluntary movement?
A) Brain
B) Heart
C) Lungs
D) Spinal cord only
4. A student accidentally steps on a sharp object and quickly lifts their foot. Which structure helps produce this rapid response?
A) Cerebrum
B) Spinal cord
C) Cerebellum
D) Skull
5. Hamza is riding a bicycle and maintains his balance while turning. Which part of the brain helps coordinate this?
A) Cerebellum
B) Medulla
C) Cerebrum
D) Spinal cord
6. A message travels from Sara's hand to her brain after she touches ice. Which type of neuron carries this message?
A) Motor neuron
B) Sensory neuron
C) Relay muscle
D) Effector neuron
7. Zain decides to move his arm to catch a ball. Which neuron carries the command from the CNS to his muscles?
A) Sensory neuron
B) Motor neuron
C) Receptor neuron
D) Relay neuron
8. A doctor explains that the brain and spinal cord together form the:
A) Peripheral nervous system
B) Central nervous system
C) Digestive system
D) Skeletal system
9. A student touches something hot and quickly withdraws their hand before consciously thinking about it. Why is this useful?
A) It protects the body quickly
B) It slows the response
C) It stops the brain working
D) It prevents sensation
10. Bilal is solving a puzzle, remembering information, and making decisions. Which part of the brain is mainly responsible?
A) Cerebrum
B) Cerebellum
C) Medulla
D) Spinal cord
11. During a race, a runner hears the starting signal and immediately begins running. What detects the sound?
A) Ear receptors
B) Motor neurons
C) Muscles
D) Spinal cord
12. A person's heart continues beating while they are asleep. Which part of the brain helps control this involuntary activity?
A) Cerebrum
B) Cerebellum
C) Medulla oblongata
D) Spinal cord
13. A doctor finds that a patient's nerves are not carrying messages properly from the skin to the brain. Which neurons may be damaged?
A) Motor neurons
B) Sensory neurons
C) Muscle cells
D) Blood cells
14. A person wants to pick up a glass. Which sequence is most appropriate?
A) Brain → motor neuron → muscle
B) Muscle → brain → sensory neuron
C) Receptor → muscle → brain
D) Brain → sensory neuron → muscle
15. A gymnast struggles to maintain balance and coordinate movements after an injury. Which part of the brain may be affected?
A) Cerebellum
B) Cerebrum
C) Medulla
D) Spinal cord
16. A student feels pain after accidentally cutting their finger. What detects the painful stimulus?
A) Sensory receptors
B) Motor neurons
C) Muscles
D) Bones
17. A message travels through a neuron using electrical signals. What is the main function of a neuron?
A) Carry nerve impulses
B) Produce blood
C) Digest food
D) Pump oxygen
18. During a reflex action, the pathway is usually:
A) Receptor → sensory neuron → spinal cord → motor neuron → effector
B) Muscle → brain → receptor → sensory neuron
C) Brain → receptor → motor neuron → spinal cord
D) Receptor → muscle → sensory neuron → brain
19. A student hears a loud sound and turns their head toward it. Which system detects and responds to the stimulus?
A) Nervous system
B) Digestive system
C) Skeletal system
D) Reproductive system
20. A person has difficulty making decisions, thinking, and remembering after a brain injury. Which part is most likely affected?
A) Cerebrum
B) Cerebellum
C) Medulla
D) Spinal cord
21. While playing basketball, a player sees the ball and decides to catch it. Which type of action is catching the ball?
A) Voluntary action
B) Reflex action
C) Involuntary action
D) Automatic response
22. A doctor explains that nerves connect the CNS with different parts of the body. These nerves are part of the:
A) Peripheral nervous system
B) Central nervous system
C) Skeletal system
D) Endocrine system
23. A person suddenly feels frightened and their heartbeat increases. Which system helps produce this rapid response?
A) Nervous system
B) Digestive system
C) Skeletal system
D) Excretory system
24. A student touches a cold metal surface. The receptors in their skin send information toward the:
A) CNS
B) Muscles
C) Bones
D) Heart
25. A motor neuron carries a signal to a muscle. What happens when the signal reaches the muscle?
A) The muscle responds
B) The brain stops working
C) The receptor detects light
D) The spinal cord disappears
26. A patient has an injury to the spinal cord. Why can this affect movement and sensation?
A) It can interrupt messages between the brain and body
B) It controls digestion only
C It produces red blood cells
27. During a test, a doctor taps below a patient's kneecap and the lower leg moves automatically. This is a:
A) Reflex action
B) Voluntary action
C) Learned response
D) Conscious decision
28. A student sees a bright light and the pupils of their eyes become smaller automatically. This is an example of:
A) Involuntary response
B) Voluntary movement
C) Learned behavior
D) Reflex involving muscles only
29. A message from the brain tells your hand muscles to move. Which pathway does the message use?
A) CNS → motor neuron → muscle
B) Muscle → sensory neuron → CNS
C) Receptor → sensory neuron → muscle
D) CNS → sensory neuron → receptor
30. A student is asked to explain why the nervous system is important. Which answer is most accurate?
A) It detects information, processes it, and coordinates responses
B) It only controls breathing
C) It only controls voluntary movements
D) It only carries blood around the body
