Negative Feedback Flashcards

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  • Make sure you understand the information on each card. If something’s unclear, click the link to the revision notes at the bottom of the page for more details.

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Note: We may include questions that have multiple correct answers. It’s useful to remember specific examples to understand these concepts better.

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What is negative feedback in the body?

Negative feedback is a regulatory system that helps maintain conditions in the body within an ideal range by detecting changes and triggering responses to bring them back to normal levels.

What conditions are kept constant in humans using negative feedback?

Body temperature, water concentration, and blood glucose concentration.

What role does adrenaline play in the body?

Adrenaline, produced by the adrenal glands during stress or fear, prepares the body for the ‘fight or flight’ response by increasing heart rate, dilating bronchioles, diverting blood to muscles, converting glycogen to glucose, dilating pupils, and widening blood vessels.

How is thyroxine regulated in the body?

Thyroxine is regulated by negative feedback.

Low thyroxine levels trigger the hypothalamus to release TRH, which causes the pituitary gland to release TSH, stimulating the thyroid to produce more thyroxine.

Normal levels stop TRH and TSH release to maintain balance.

What are the main roles of thyroxine in the body?

Thyroxine stimulates the body’s basal metabolic rate and protein synthesis, which are important for growth and development.

How does adrenaline affect the body during the ‘fight or flight’ response?

Adrenaline increases heart rate, dilates bronchioles, diverts blood to muscles, converts glycogen to glucose, dilates pupils, and widens blood vessels to prepare the body to respond quickly in critical situations.

Revision Notes
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