Nervous System Quiz

What are the two main parts of the nervous system?

• Central and Peripheral Nervous System

• Brain and Spinal Cord

• Sensory and Motor Nerves

• Reflex and Stimulus

Answer explanation

The nervous system is divided into two main parts: the Central Nervous System (CNS), which includes the brain and spinal cord, and the Peripheral Nervous System (PNS), which connects the CNS to the rest of the body.

What does the central nervous system consist of?

• Nerves and muscles

• Brain and spinal cord

• Motor nerves

• Sensory organs

Answer explanation

The central nervous system consists of the brain and spinal cord, which are responsible for processing and transmitting information throughout the body. Other options like nerves and muscles do not define the central nervous system.

What is the function of the peripheral nervous system?

• To protect the brain

• To form a communication network

• To control reflex actions

• To process sensory information

Answer explanation

The peripheral nervous system functions primarily to form a communication network between the central nervous system and the rest of the body, facilitating sensory and motor signals.

What protects the brain?

• Muscles

• The skull

• The spinal cord

• Nerves

Answer explanation

The skull is the bony structure that encases and protects the brain from physical damage. Muscles, the spinal cord, and nerves do not provide this direct protective function.

What is the role of the spinal cord?

• To control breathing

• To protect the brain

• To send messages to the brain

• To process emotions

Answer explanation

The spinal cord's primary role is to send messages to the brain, facilitating communication between the brain and the rest of the body. This is essential for coordinating movement and processing sensory information.

What are nerves compared to in the text?

• Bones

• Wires or cables

• Cells

• Muscles

Answer explanation

In the text, nerves are compared to wires or cables because they transmit signals throughout the body, similar to how wires carry electricity. This analogy highlights their role in communication within the nervous system.

What type of nerves send messages from sense organs to the brain?

• Reflex nerves

• Motor nerves

• Spinal nerves

• Sensory nerves

Answer explanation

Sensory nerves are responsible for transmitting messages from sense organs (like eyes and ears) to the brain, allowing us to perceive our environment. This makes them the correct choice for the question.

What do motor nerves do?

• Send messages to the brain

• Control reflex actions

• Carry responses from the brain

• Protect the spinal cord

Answer explanation

Motor nerves carry responses from the brain to muscles and glands, enabling movement and action. They do not send messages to the brain or protect the spinal cord, making 'carry responses from the brain' the correct choice.

What is a stimulus?

• A part of the brain

• A type of nerve

• Something that causes an action

• A response to a message

Answer explanation

A stimulus is defined as something that causes an action. It triggers a response in an organism, making this choice the correct answer. The other options do not accurately describe what a stimulus is.

What is a reflex action?

• A voluntary action

• A brain function

• An automatic response to a stimulus

• A type of nerve

Answer explanation

A reflex action is an automatic response to a stimulus, meaning it occurs without conscious thought. This distinguishes it from voluntary actions, which require brain involvement and decision-making.