Homeostasis Flashcards

1
Q

What is meant by negative feedback?

A

Bringing back monitored variables within a set range

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2
Q

What is the overall goal of homeostasis?

A

To allow maintenance of an optimum internal environment

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3
Q

What is defined as feed forward systems?

A

When the body anticipates and responds to changes in the environment before they have an effect.

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4
Q

Give two examples of feed forward mechanisms?

A

Salivating before eatingSkin activates response to temperature before internal body temperature change arises

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5
Q

What is positive feedback?

A

An initial disturbance sets off a train of events that leads to an even greater disturbance.eg - action potential

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6
Q

How does daily input and output of water compare on a daily basis?

A

It is the same

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7
Q

What fraction of body water is ICF?

A

Two thirds

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8
Q

How much of ECF is plasma?

A

20%

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9
Q

Why do women and old people have lower water content?

A

Women have a higher proportion of body fatOld people have less muscle

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10
Q

What is the only difference in composition between ISF and plasma?

A

Plasma contains plasma proteins

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11
Q

Concentration =

A

Mass/volume

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12
Q

What is the only region who’s water content can be directly measured?

A

Plasms

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13
Q

Give examples of substances that can be used to measure the ECF?

A

SucroseNa+Cl-(Substances that can not pass over the plasma membrane)

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14
Q

What is used to measure the water content of the plasma?

A

Radioactively labelled or dyed proteins

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15
Q

How do you measure total body water?

A

Using a radioactive water (deuterium oxide)

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