nervous system

nerve

A bundle of nerve fibers

neuron

A cell that carries imformation through the nervous system

interneuron

A neuron that carries nerve impulses from one neuron to another

sensory neuron

A neuron that picks up stimuli from the internal or external enviroment and converts each stimulus into a nerve impulse

Motor neuron

A neuron that sends an impulse to a muscle or gland, causing the muscle or gland to react

reflex

A response to a stimulus that is processed in the spinal cord to protect you body from grave danger.

axon

A threadlike extension of a neuron that carries nerve impulses away from the cell body

dendtrite

A threadlike extenstion of a neuron that carries nerve impulses toward the cell body

Cerebrum: conscious thought intelligence, voluntary muscles, emotions. Cerebellum: muslce, coordination, keeps your balance Brain stem: (medulla oblongata and pons): involuntary muscles -- cardiac muscle, breathing, sneezing, digestion

Describe the functions of the three main regions of the brain.

Stimulus: temperature is really hot. Sensory neurons are going to communicate to the brain that is hot. Interneuron will relay that message to the motor neuron. Motor neuron will trigger the sweat glands.

Give an example of a stimulus and describe how the nervous system produces a response.

For a nerve impulse to be carried along at a synapse, it must cross the gap between axon and the next structure. The axon tips release chemicals that carry the impulse across the gap.

How do nerve impulses travel from one neuron to another?

You don't get hurt because you react quicker. The information doesn't need to be relayed all the way to the brain before your body reacts.

How do reflexes help protect the body from injury?

Sensory pick up information; motor neuron triggers the response by activating a muscle gland, etc.

How do sensory and motor neurons differ?

Somatic is voluntary actions (skeletal muscles), autonomic is involuntary (cardiac and smooth muscles)

How do the functions of the two groups of peripheral nerves differ?

Sensory neurons pick up input. Interneuron carry it to the motor neurons. Motor neuron triggers muscle, gland, etc.

How do the three kinds of neurons interact to carry nerve impulses?

Motor neuron, interneuron, sensory neuron.

Identify the three kinds of neurons that are found in the nervous system.

Look at the picture! Dendrites receive the "message" (neurotransmitters) the message travels down the axon (psed up by the myelin sheath) to the axon terminals. The axon terminals release more neurotransmitters, which are picked up by the next dendrite.

Outline the steps by which a nerve impulse reaches and then crosses the gap at a synapse.

synapse

The junction where one neuron can transfer an impulse to the next structure

Nerve impulsive

The message carried by a neuron

Sensory neurons pick up stimulus. Interneuron communicate to the spinal cord, where the information is processed and transmitted out to the motor neuron. Then, information about pain is relayed to brain later.

Trace the pathway of a reflect in the nervous system.

The nervous system receives information about what is happening both inside and outside your body. It also directs the way in which your body responds to this information. In addition, your nervous system helps maintain homeostasis.

What are the functions of the nervous system?

Somatic and autonomic.

What are the two groups of nerves into which the peripheral nervous system is divided?

Sense the environment, respond to the environment, and maintain homeostasis.

What are three functions of the nervous system?

When your brain hits the inside of your skull . It is like a brain bruise.

What is a concussion?

The space between two neurons.

What is a synapse?

A neuron has a large cell body that contains the nucleus, threadlike extensions called dendrites, and an axon.

What is the structure of a neuron and what kinds of neurons are found in the body?

Trouble judging distance, falling, wobbly, balance is off.

What symptoms might indicate that a person's cerebellum has been injured?

Brain, spinal cord.

What two structures are part of the central nervous system?

response.

a reaction to a stimulus

Stimulus.

a signal to which an organism responds