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Biology > Homeostasis > Flashcards

Homeostasis Flashcards

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1
Q

What is homeostasis?

A

Maintaining a constant internal environment

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2
Q

What is negative feedback?

A

A change to the normal level triggers a response which reverses effects of change

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3
Q

What is positive feedback?

A

A change to the normal level triggers a response which increases effects of change

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4
Q

What is a co-ordinator?

A

Brain stimulates pituary gland to secrete oxytocin

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5
Q

Body temperature is controlled by what in the brain?

A

The hypothalamus

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6
Q

How is the body effected by a fall in temperature?

A

Shivering, blood directs to body centre, increased metabolical rate and secretion of TSH

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7
Q

How is the body effected by an increase in temperature?

A

Sweating, Vasodilution, more heat released by radiation and sweating increasing

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8
Q

BGC (groups of genes involved in the production of metabolites) is decreased by what?

A

Insulin

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9
Q

BGC (groups of genes involved in the production of metabolites) is increased by what?

A

Glucagon

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10
Q

Body waters needs to be maintained to order what?

A

Maintain blood volume and blood pressure

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11
Q

Water balace is important because it allows what?

A

Blood to be transported around the body to ensure all tissues get oxygen

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12
Q

If blood volume is too high what is caused?

A

hypotension

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13
Q

How do we gain water?

A

Food + Drinks

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14
Q

How do we lose water?

A

Urine, sweat, breathing

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15
Q

What are the two functions of the kidneys?

A

Excretion of urea + Osmoregulation

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16
Q

What is Osmoregulation?

A

Controls of water and salt levels, and is an example of negative feedback

17
Q

Why is glucose in urine a sign of diabetes?

A

Lack of insulin, High Blood Glucose + Not all of it is selectively reabsorbed

18
Q

What are hypotension impacts on tissue fluid formation?

A

Reduces water potential, increases tissue volume, less water can be absorbed, fluids are forced out

19
Q

How does negative feedback control the bodies water balance

A

More water is reabsorbed, ADH binds to receptors, causes vesticles to fuse with the cell membrane and reduce water reabsorption

Biology (13 decks)

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