7th+Grade+Life+Science+Study+questions

Life Science Chapter 19-1 How the Nervous System Works Name: __

1. What does the nervous system receive and direct?

2. Explain the difference between a stimulus and response.

3. How does the nervous system maintain homeostasis?

4. What are neurons and nerve impulses?

5. Describe the structure of a neuron.

6. Explain the difference between dendrites and axons.

7. What are nerve fibers and how are they arranged?

8. A bundle of nerve fibers are called what?

9. List the 3 kinds of neurons and explain how each functions.

10. In what form does a nerve impulse travel?

11. Using Figure 3, explain how the 3 kinds of neurons interact to carry nerve impulses.

12. What is a synapse and how does the impulse cross the gap at a synapse?

Life Science Chapter 19-2 Divisions of the Nervous System

1. Explain the difference between the central nervous system and the peripheral nervous system.

2. Describe the function of the brain and the spinal cord.

3. The brain contains how many neurons and what type are they?

4. Describe the structures that protect the brain.

5. What are the 3 main regions of the brain?

6. Which region is the largest part of the brain and what does it do? 7. Explain what the right and left sides of the cerebrum control and what they are associated with.

8. What is the 2nd largest part of your brain and what does it do?

9. Where is your brain stem found and what does it do?

10. What is the spinal cord and how is it protected?

11. What does the peripheral system consist of and the types of actions it controls?

12. How many pairs of nerves make up the peripheral nervous system and where are they found?

13. Explain how a spinal nerve functions. Be complete.

14. The peripheral nervous system is divided into what 2 groups? What is the difference between the two?

15. What is a reflex and why do you have them?

16. Using Figure 9, explain how a reflex act works.

17. What is a concussion and when does it occur?

18. What are the symptoms of a concussion and how can you prevent it? 19. When do spinal cord injuries occur? 20. What is paralysis?

Life Science Chapter 19-3 The Senses

1. Your eyes respond to what stimulus and what do they do with it?

2. Explain what the cornea and pupil are and what do they do?

3. What is the iris and what does it do?

4. What is the lens and explain what happens to light as it goes through it?

5. After the light goes through the lens, what does it go through to reach the retina?

6. What is the retina and what does it contain? 7. Describe the difference between rods and cones.

8. What happens once the light strikes the rods and cones?

9. Describe the two things that happen in the cerebrum

10. Describe what a person who is nearsighted sees and why it happens.

11. How is nearsightedness corrected? How does the correction work?

12. What do farsighted people see and what causes it?

13. How is farsightedness corrected and how does the correction work?

14. Explain how sound is produced.

15. What can sound waves travel through?

16. What are the 3 regions of your ear?

17. Name the 2 parts of your outer ear.

18. Name the parts of the middle ear and what they do.

19. Name the 3 parts of the inner ear.

20. Explain the function of the cochlea.

21. Where in the ear are the semicircular canals located?

22. Explain how the semicircular canals are responsible for your sense of balance.

23. How do the senses of smell and taste work closely together?

24. How many odors can the nose detect compared to the tastes that tongue can?

25. How does a cold affect your ability to taste?

26. What is your largest sense organ? 27. What does your skin contain and what do they respond to?

28. Why are the pain receptors one of your body's most important feelings?

Life Science Chapter 19-4 Alcohol and Other Drugs

1. What is a drug and what do many affect?

2. What is drug abuse? Can you abuse medicines?

3. Why are the most commonly abused drugs such as marijuana, alcohol, and cocaine especially dangerous?

4. Describe the different effects different drugs have.

5. What is tolerance and what can it cause people to do?

6. What happens in addiction?

7. What is withdrawal and what can happen during it?

8. Explain how drug abuse can affect a person's health indirectly.

9. What serious legal and social effects can drug abuse have?

10. What are the commonly abused drugs and what do they affect?

11. What are depressants, how do they affect you, and give common drug types that are depressants.

12. What do stimulants do to your body? Give examples.

13. Explain the difference between inhalants and hallucinogens. Give examples of each.

14. What are anabolic steroids? How do they affect your body?

15. What is alcohol?

16. Explain how alcohol gets into your body.

17. What is BAC and what does a value of 0.1 % mean? 18. Using Figure 21, list the short term effects of alcohol.

19. Describe how long-term alcohol abuse can affect your brain and liver.

20. What is alcoholism and how can you stop it?