Plant Responses

Question 1

What is reflex action?

Answer 1

The body responding to situations without conscious thought- A involuntary response to a sensory stimulus.

Question 2

What are the pathway of neurones involved in reflex action?

Answer 2

Receptor - detects stimulus and creates an action potential in the sensory neurone.

Sensory neurone - carries impulse to spinal cord.

Relay neurone - connects the sensory neurone to the motor neurone within the spinal cord or brain.

Motor neurone - carries impulse to the effector to carry out the appropriate response.

Question 3

What is the spinal cord?

Answer 3

The spinal cord is a column of nervous tissues running up the back.

Surrounded by the spine for protection

Question 4

Describe the knee jerk reflex?

Answer 4

• Is a spinal reflex- neural circuit only goes to the spinal cord.
• when the leg is tapped at the patella (below kneecap)
  -stretches the patella tendon and acts as a stimulus.
• stimulus initiates a reflex
  -causes extensor muscles (top of thigh) to contract
  -