Unit 3.1

Question 1

What are the three main functions of the nervous system?

Answer 1

1. Sensation – Analyzes sensory information from the environment or body
2. Integration – Stores information and makes decisions about responses
3. Response – Initiates motor responses like muscle contractions or gland secretions

Question 2

What are the two main parts of the nervous system?

Answer 2

1. Central Nervous System (CNS) – Brain and spinal cord
2. Peripheral Nervous System (PNS) – Nerve cells that carry information to or from the CNS

Question 3

What are the two divisions of the Peripheral Nervous System (PNS)?

Answer 3

1. Somatic Nervous System (SNS) – Controls conscious perception and voluntary movement of skeletal muscles
2. Autonomic Nervous System (ANS) – Controls involuntary functions, like glandular secretions and organ maintenance

Question 4

What does the Somatic Nervous System (SNS) do?

Answer 4

It controls conscious perception and voluntary movement of skeletal muscles.

Question 5

What does the Autonomic Nervous System (ANS) do?

Answer 5

It controls involuntary functions, including gland secretions, organ maintenance, and reflex movement of skeletal muscles.

Question 6

What is the function of receptors in the nervous system?

Answer 6

Receptors are specialized cells that detect stimuli (changes in the environment) and produce electrical impulses in response.

Question 7

Where are receptors found?

Answer 7

Receptors are found in sense organs, which respond to specific stimuli.

Question 8

Match the sense organ with its stimulus: Skin, Tongue, Nose, Eye, Ear

Answer 8

1. Skin → Touch, temperature
2. Tongue → Chemicals (in food and drink)
3. Nose → Chemicals (in the air)
4. Eye → Light
5. Ear → Sound

Question 9

What are effectors in the nervous system?

Answer 9

Effectors are muscles and glands that produce a response to a detected stimulus.

Question 10

Give three examples of effectors responding to stimuli.

Answer 10

1. A muscle contracting to move an arm
2. A muscle squeezing saliva from the salivary gland
3. A gland releasing a hormone into the blood

Question 11

Summarize the flow of information in the nervous system.

Answer 11

1. Receptor detects stimulus
2. Electrical impulse is sent through nerves
3. Effector (muscle or gland) produces a response