Stimuli and response

Usain Bolt, the Olympic winner of 100m in 2016 has the fastest reaction time which is less than 0.1s. What is the stimuli involved in his response?

• Eyes

• Ear

• Muscles

• Touch

Beside brain and spinal cord, the human nervous system is supported by

• Cranial nerves

• Spinal nerves

• Peripheral nervous

The importance of human nervous system are

• Detects stimuli

• sends information

• interprets impulses

• detects responses

The following process is an example of responses in the human body

• Conscious action

• Voluntary action

• Controlled by Medulla Ablongata

• Involuntary action

When a phone alarm rings, we woke up and switched off the alarm. What is the hands action represent?

• Sound

• Affector

• Effector

• Nerve impulses

The direction of impulse from the stimulus to response is

• Heat --> affector --> spinal cord --> effector --> withdrawal of hand.

• Heat --> affector --> effector --> spinal cord --> withdrawal of hand.

• Heat --> receptor --> spinal cord --> affector --> effector --> withdrawal of hand.

The following are examples of involuntary action

• Sneezing

• Eating

• Coughing

• Walking

The following are examples of voluntary actions

• Surprise

• Walking

• Jerking

• Dancing

The part shows on the diagram are?

• Sclera

• Iris

• Pupil

• Retina

The retina has two types of photoreceptors: the cone cells and the rod cells. Choose the correct statement.

• The rod cells are sensitive to colours

• The cone cells are sensitive to colours of light

• The rod cells are sensitive to different light intensities

• The cone cells are sensitive at dim light