The Nervous System

What is a stimulus?

• A change in the environment that causes a response in an organism.

• A type of organism that responds to stimuli.

• A method of communication between organisms.

• A physical reaction to an external factor.

What is the main function of the nervous system?

• To control and coordinate the body's activities and respond to internal and external stimuli.

• To digest food and absorb nutrients.

• To circulate blood and transport oxygen throughout the body.

• To provide structural support and protect internal organs.

What are the three main parts of the nervous system?

• Brain, spinal cord, and neurons.

• Heart, lungs, and liver.

• Stomach, intestines, and pancreas.

• Skin, hair, and nails.

How do sensory neurons and motor neurons work together?

• Sensory neurons send information to the brain, which processes it and sends signals through motor neurons to execute a response.

• Motor neurons send information to the sensory neurons to initiate a response.

• Sensory neurons and motor neurons operate independently without any interaction.

• Motor neurons only receive signals from the brain without any input from sensory neurons.

What is the function of the brain?

• To process information, control thoughts, emotions, and coordinate actions.

• To regulate body temperature and maintain homeostasis.

• To produce hormones and control growth.

• To filter toxins and purify blood.

What are neurons?

• Specialized cells that transmit nerve impulses throughout the body.

• Cells that produce hormones in the endocrine system.

• Cells that form the protective barrier around the brain.

• Cells that store energy in the form of fat.

What is the difference between voluntary and involuntary actions?

• Voluntary actions are controlled consciously, while involuntary actions occur automatically without conscious control.

• Voluntary actions are always harmful, while involuntary actions are always beneficial.

• Voluntary actions require physical effort, while involuntary actions do not require any effort.

• Voluntary actions are performed by the brain, while involuntary actions are performed by the heart.

What is a sensory neuron?

• A type of neuron that carries information from sensory receptors (like eyes and skin) to the brain.

• A type of neuron that transmits signals from the brain to muscles.

• A type of neuron that connects different parts of the brain.

• A type of neuron that is responsible for processing emotions.

What is the peripheral nervous system (PNS)?

• The part of the nervous system that includes all the nerves outside the CNS.

• The part of the nervous system that includes the brain and spinal cord.

• The part of the nervous system responsible for processing sensory information.

• The part of the nervous system that controls involuntary actions.

What is a reflex action?

• A voluntary movement in response to a stimulus.

• An automatic response to a stimulus that does not involve conscious thought.

• A learned behavior that requires conscious thought.

• A reaction that occurs only after a period of contemplation.