B13 Co-ordination and Communication

Which of the following statements is true about how electrical impulses travel in the body?

• Electrical impulses travel through the bloodstream.

• Electrical impulses travel along neurons.

• Electrical impulses travel through muscle tissues.

• Electrical impulses travel between cells via chemical diffusion.

 The central nervous system (CNS) consists of which of the following?

• Brain and spinal cord

• Brain and peripheral nerves

• Spinal cord and peripheral nerves

• Nerves and muscles

The peripheral nervous system (PNS) includes:

• Only the brain

• The brain and spinal cord

• Nerves outside the brain and spinal cord

• Only the spinal cord

What is the primary role of the nervous system in mammals?

• To break down food into nutrients

• To circulate blood around the body

• To coordinate and regulate body functions

• To provide structural support to the body

Which type of neuron is responsible for transmitting signals from receptors to the central nervous system?

• Motor neuron

• Relay neuron

• Sensory neuron

• All of the above

 In a simple reflex arc, which neuron connects the sensory neuron to the motor neuron in the spinal cord?

• Sensory neuron

• Relay neuron

• Motor neuron

• Effector

Which of the following best describes a reflex action?

• A voluntary and slow response to a stimulus

• A conscious and rapid action in response to a stimulus

• An automatic and rapid response to a stimulus

• A conscious action that requires thinking

 In a simple reflex arc, which part of the body acts as the effector?

• The brain

• Muscles or glands

• The spinal cord

• Sensory neurons

Sense organs contain specialized cells that detect stimuli. What are these cells called?

• Effectors

• Neurons

• Receptors

• Reflex cells

Which type of stimulus is detected by the eyes?

• Sound

• Light

• Temperature

• Chemical