What is the purpose of the motor neuron?

The purpose of the motor neuron is **to carry information from the brain or spinal cord to muscles and glands**. Motor neurons are responsible for transmitting signals that lead to muscle contraction and glandular secretion.

Which structure is at work when the body deals with reflex actions?

the heart
the brain stem
the vertebral column
the spinal cord

2. Which statement best describes the central nervous system?

It senses stimuli and carries out a reaction.
It secretes hormones.
It is made up of all nerve cells.
It is made up of the brain and the spinal cord.

3. What happens to the body when motor neurons are injured?

It releases more neurotransmitters.
It loses muscle movement.
It experiences increased stimuli.
It shows a decrease in inflammation.

4. Which function does a neuron perform in a human body?

It generates electrochemical signals so that the body can react to stimuli.
It produces antibodies to destroy pathogens for protection purposes.
It breaks down chemical substances into a form that is usable by the body.
It delivers oxygen to the cells of the body for metabolic processes.

5. The sympathetic and parasympathetic nervous systems are both part of which division of the nervous system?

the central nervous system
the peripheral nervous system
the somatic nervous system
the autonomic nervous system

6. Examine the words.

impulse, presynaptic cell, neurotransmitters, receptors, postsynaptic cell

What idea can be described using all the words listed?

the difference between the somatic and autonomic nervous systems
the transfer of information from one neuron to another
the difference between the central and peripheral nervous systems
the flow of information within a neuron

7. When Gretchen starts being chased by a dog, her brain sends a signal to her muscles to run. Which neurons are at work?

sensory neurons
motor neurons
voluntary neurons
involuntary neurons

8. Which is a function of the central nervous system?

pumping blood through the body
controlling coordination in the body
fighting bacteria that enter the body
breaking down carbohydrates in the body

9. Which is an example of how the peripheral nervous system helps the body maintain its internal environment?

Muscles produce keratin so that hair can grow stronger.
Sweat glands break down the food that is consumed.
Muscles contract rapidly to produce heat on a cold day.
The brain recalls information to help take a test.

10. Which is a function performed by the central nervous system (CNS)? Select all that apply.

processing information that is received from the stimuli receptors
receiving stimuli and making the body react to those stimuli
sending out information so that the body can react appropriately to stimuli
coordinating reflexes and reactions to stimuli
sensing stimuli and causing reactions in the body

Here are the answers to your questions:

1. **Which structure is at work when the body deals with reflex actions?**
- **the spinal cord**

2. **Which statement best describes the central nervous system?**
- **It is made up of the brain and the spinal cord.**

3. **What happens to the body when motor neurons are injured?**
- **It loses muscle movement.**

4. **Which function does a neuron perform in the human body?**
- **It generates electrochemical signals so that the body can react to stimuli.**

5. **The sympathetic and parasympathetic nervous systems are both part of which division of the nervous system?**
- **the autonomic nervous system**

6. **What idea can be described using all the words listed?**
- **the transfer of information from one neuron to another**

7. **When Gretchen starts being chased by a dog, her brain sends a signal to her muscles to run. Which neurons are at work?**
- **motor neurons**

8. **Which is a function of the central nervous system?**
- **controlling coordination in the body**

9. **Which is an example of how the peripheral nervous system helps the body maintain its internal environment?**
- **Muscles contract rapidly to produce heat on a cold day.**

10. **Which is a function performed by the central nervous system (CNS)? Select all that apply.**
- **processing information that is received from the stimuli receptors**
- **receiving stimuli and making the body react to those stimuli**
- **sending out information so that the body can react appropriately to stimuli**
- **coordinating reflexes and reactions to stimuli**
- **sensing stimuli and causing reactions in the body**

All options in question 10 are correct and describe functions performed by the central nervous system.

10. processing information that is received from the stimuli receptors

sending out information so that the body can react appropriately to stimuli
coordinating reflexes and reactions to stimuli

It looks like you're highlighting specific functions of the central nervous system (CNS) from the list provided in question 10. To clarify, the following functions of the CNS are indeed correct:

1. **Processing information that is received from the stimuli receptors** - The CNS interprets signals coming from sensory receptors in order to understand the environment.

2. **Sending out information so that the body can react appropriately to stimuli** - The CNS sends signals to effectors (muscles and glands) to initiate appropriate responses.

3. **Coordinating reflexes and reactions to stimuli** - The CNS is involved in the reflex arc, allowing for immediate responses to certain stimuli without the need for conscious thought.

If you need further clarification or details on these functions or their roles in the nervous system, let me know!