Stimuli and Responses

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Created by: Ebissett
Created on: 22-03-18 20:37

What is a stimulus?

A change in the internal or extreme environment

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Name the three types of neurone

Sensory, relay, Motor

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What is a reflex?

Where the body responds to a stimulus without making a conscious decision to respond

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How can reflexes help to protect the body?

They bring about a response from a dangerous situation e.g. hot plate without making a conscious decision

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What is positive gravitropism?

Where plants grow towards the force of gravity

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Describe the difference between taxes and kineses

Taxes is the tactic response where organisms move away or towards a directional stimulus such as light. Kineses is the kinetic response, where organisms move away or towards a non directional stimulus such as humidity

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Why are receptors described as specific?

Because a receptor only responds to one type of stimulus e.g. pressure, light

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In the human eye, which type of photoreceptor is more sensitive to light?

Rod

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Why is heart muscle described as being myogenic?

Because it contracts and relaxes simultaneously without receiving a message from the brain

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What is the function of the bundle of his?

It is responsible for conducting the waves of electrical activity between the ventricles to the apex (bottom) of the heart

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Why do animals need to alter their heart rate?

To respond to internal conditions, such as not fainting when blood pressure gets too low

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Name the effectors that are involved in increasing and decreasing heart rate

Cardiac muscles

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Other cards in this set

Card 2

Front

Name the three types of neurone

Back

Sensory, relay, Motor

Card 3

Front

What is a reflex?

Back

Card 4

Front

How can reflexes help to protect the body?

Back

Card 5

Front

What is positive gravitropism?

Back

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Stimuli and Responses