Introduction to Stimulus and Response

These flashcards cover the essential topics related to stimulus and response from the lecture notes, providing a useful review for exam preparation.

What is the primary role of organisms in response to stimuli from the environment?

To detect stimuli and respond accordingly, which is critical for survival.

What might happen if an organism does not respond to stimuli?

Ignoring stimuli can lead to danger, damage, or even death.

What is a stimulus in the context of organisms?

A change in the environment that elicits a response from an organism.

What is an example of a stimulus that organisms might respond to?

Threats, food availability, temperature changes, or light.

How does the body recognize stimuli?

The body has receptors that detect environmental changes.

What types of things can receptors in the body detect?

Heat, pressure, light, sound, smell, taste, and temperature.

What happens when an organism detects a stimulus?

The stimulus is processed through specialized receptors, then sent to neurons.

What is the purpose of sensory neurons?

To carry information about stimuli to the brain and spinal cord.

What are interneurons?

Nerve cells that act as intermediaries, processing information and facilitating responses.

What is a reflex action?

An involuntary response to a stimulus that occurs quickly without conscious thought.

How can smell influence memory?

Smell is closely linked to memory and can trigger vivid recollections.

Why do we often not notice our watch on our wrist?

The brain blocks constant signals from receptors when they don't indicate harm.

What can happen when you injure a fingertip?

It can hurt severely due to the high density of nerve endings in that area.

How do responses to stimuli vary among animals?

Higher-level organisms have more complex responses due to more interneurons.

What is the main role of motor neurons?

To carry out the response by communicating with muscles or other systems.

What is the function of sensory receptors in our fingertips?

To perceive textures, temperatures, and other tactile information.

What is the difference between voluntary and involuntary responses?

Voluntary responses are controlled by the brain, while involuntary responses occur automatically.

Why do we rarely see people getting hit in the eye?

The eyelid closes rapidly as a reflex to protect the eye.

What does it mean when a body 'loses awareness' of constant stimuli?

The brain stops sending signals about the stimulus because it is deemed non-threatening.

What might trigger a fight or flight response in an organism?

A perceived threat detected via environmental stimuli.

How do organisms respond to environmental dangers?

Responses can be physical (moving) or chemical (hormonal reactions).

What evolutionary trend can be observed in the nervous systems of lower organisms?

They have simpler nervous systems with fewer interneurons.

What concept describes the immediate reaction to a dangerous stimulus?

Reflex action.

How do stimuli contribute to an organism's survival?

They prompt necessary responses to navigate dangers and opportunities in the environment.

Why is it essential for an organism to respond to changes in the environment?

To ensure survival by avoiding danger and seeking resources.

In what ways can the body prioritize which stimuli to respond to?

Through receptors that determine the importance of different stimuli based on context.