Communication + Homeostasis Flashcards

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1
Q

Other than a suitable pH and tempreture, what do enzymes need to work at an optimum level?

A

An aqueous environment that keeps substates and products in solution (eg water)
Freedom from toxins and excess inhibitors

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2
Q

In terms of the enviornment, what is a stimulus?

A

An environmental change (eg, tempreture change)

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3
Q

How do the activites of a cell alter their own enviornment?

And give an example of a stimulus and response to do with this

A

Metabolic activities use up substrates, and produce products (possibly toxic)
Stimulus = build up of toxins
Response = removal of toxins

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4
Q

How does the blood help maintain the internal enviornment of the cells?

A

Removes the waste and toxins

Ensures that all cells are supplied with enough substrates that are needed?

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5
Q

What will a good communication system do?

A

Cover the whole body
Enable specific / rapid communication
Enable both short / long term responses

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6
Q

What type of communication system allows rapid responses?

A

Neuronal system

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7
Q

Define Homeostasis

A

The maintanence of a constant internal environment

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8
Q

Explain positive feedback

A

A process that increases any change that is detected by the receptors

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9
Q

Explain negative feedback

A

The process that brings about a reversal of any change in conditions, so an optimum steady state is maintained
Stimulus&raquo_space; receptor&raquo_space; communication pathway&raquo_space; effector&raquo_space; responce

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10
Q

True of false? An ectotherms body tempreture changes with the environmental tempreture, and requires less food

A

True

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11
Q

How does an ectotherm control their tempreture?

A

Alters its physiology (moves outside / underground)

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12
Q

Define the term Endotherm

A

An organism that can use internal sources of heat, such as heat generated from metabolism, to maintain its body tempreture

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