Nervous and Endocrine Systems: Stimuli

The video tutorial explains the concept of stimuli, which are changes in the environment that can be detected by the body. It distinguishes between voluntary and involuntary responses to stimuli, providing examples such as a baseball player reacting to a ball and squinting when a light is turned on. Voluntary responses involve conscious decisions, while involuntary responses occur without conscious thought.

What is a stimulus in the context of the environment?

• A constant factor in the environment

• A change in the environment

• A type of response

• A voluntary action

Which of the following is an example of a voluntary response?

• Heart beating faster when startled

• Putting on a coat when cold

• Breathing harder during exercise

• Squinting in bright light

How do involuntary responses differ from voluntary responses?

• They are always related to sound

• They occur without conscious thought

• They require conscious thought

• They are slower than voluntary responses

Which of the following is NOT an involuntary response?

• Breathing harder during exercise

• Deciding to wear a hat

• Covering your eyes in bright light

• Squinting when a light is turned on

What happens when you are in a dark room and the light is suddenly turned on?

• You decide to turn off the light

• You start running

• You squint or cover your eyes

• You feel warmer