B3.2.2 - Negative Feedback Flashcards

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1
Q

What is thyroxine?

A

A hormone produced in the thyroid gland

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2
Q

What does thyroxine do?

A

Play a vital role in regulating the body’s metabolic rate

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3
Q

What is a metabolic rate?

A

The speed at which the body transfers energy from chemical stores in order to perform its functions

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4
Q

What is the function of the thyroid gland?

A

To take iodine and convert it into thyroxine

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5
Q

What does the thyroid gland combine iodine with to convert it into thyroxine?

A

Tyrosine (an amino acid)

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6
Q

Where does the thyroid gland get iodine from?

A

Food

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7
Q

Where are the adrenal glands?

A

Near your kidneys

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8
Q

What do the adrenal glands secrete?

A

Adrenaline

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9
Q

What does adrenaline do?

A

Prepares the body for intensive action

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10
Q

What is negative feedback?

A

An important type of control that is used in homeostasis

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11
Q

What are the steps of negative feedback?

A

Corrective mechanisms switched off -> Conditions in the body change from set point -> Change detected by a receptor -> Corrective mechanisms activated by an effector -> Conditions returned to set point

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12
Q

What does thyroxine control?

A

How much energy is available to cells

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13
Q

What does the hypothalamus cause the pituitary gland to do when in need of more energy?

A

It causes the pituitary gland to release TSH

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14
Q

What is TSH?

A

thyroid-stimulating-hormone

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15
Q

What does TSH do?

A

Stimulate the thyroid gland to release thyroxine

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16
Q

What happens to the metabolic rate when the thyroid gland releases thyroxine?

A

It increases

17
Q

How does adrenaline prepare the body for intensive action?

A

Respire quicker - To increase the rate of ATP production
Increase the rate of breathing to cope with the need for oxygen
Increasing heart rate
Diverting blood to muscles and away from digestive system