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Biology Paper 2
Homeostasis
Negative Feedback
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Created by
lora balfe
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Cards (21)
What is the endocrine system responsible for?
Releasing
hormones
directly into the bloodstream
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Where are the adrenal glands located?
At the top of the
kidneys
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What hormone do the adrenal glands produce during stress?
Adrenaline
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What is one main effect of adrenaline?
To increase the
heart rate
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Why does the heart rate increase when adrenaline is released?
To deliver more
oxygen
and glucose to muscles
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What is the term used to describe the body's response to fear or stress?
Fight or flight
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Where is the thyroid gland located?
At the base of the
neck
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What hormone does the thyroid gland release?
Thyroxine
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What are the two main effects of thyroxine?
Stimulates
metabolic rate
and growth
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What does metabolism refer to?
The sum of all reactions in a
cell
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How is the level of thyroxine controlled?
By
negative feedback
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What monitors the level of thyroxine in the blood?
The
brain
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What does the pituitary gland release when thyroxine levels fall?
TSH
(Thyroid Stimulating Hormone)
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What triggers the thyroid gland to release more thyroxine?
TSH
in the bloodstream
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What happens when the thyroxine level increases?
The brain prevents
TSH
release
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What occurs if thyroxine levels become too high?
Events are triggered to
lower thyroxine
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What is a negative feedback cycle?
A process that
regulates
hormone levels
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Can you name other negative feedback cycles in the human body?
Blood
glucose control
and
menstrual cycle
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What are the roles of thyroxine and adrenaline in the body?
Thyroxine:
Stimulates
metabolic rate
Aids in growth and development
Adrenaline:
Increases heart rate
Prepares body for
fight or flight
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What is the general idea behind negative feedback?
Monitors
hormone levels
Triggers responses to maintain balance
Prevents
overproduction
or
underproduction
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What glands are primarily involved in the release of thyroxine and adrenaline?
Thyroid gland
: Releases thyroxine
Adrenal glands
: Release adrenaline
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