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Biology Paper 2
Homeostasis and Response
Negative Feedback
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Created by
Molos Rizaj
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Cards (17)
What should you be able to explain by the end of the video on
thyroxine
and
adrenaline
?
You should be able to explain the roles of thyroxine and adrenaline in the body.
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What is the role of hormones in the body?
Hormones
are chemicals released directly into the bloodstream by
glands
that cause effects in specific target organs.
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Where are the
adrenal glands
located?
The adrenal glands are located at the top of the
kidneys
.
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What hormone do the
adrenal glands
produce during times of fear or stress?
The adrenal glands produce the hormone
adrenaline
during times of fear or stress.
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What is one of the main effects of
adrenaline
in the body?
One of the main effects of adrenaline is to increase the
heart rate
.
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Why does an increased
heart rate
benefit the body during stress?
It delivers more oxygen and glucose to the brain and muscles, which are needed for
aerobic respiration
.
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What is the term used to describe the body's response to fear or stress?
Scientists call this response the
fight or flight response
.
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Where is the
thyroid gland
located?
The thyroid gland is found in the base of the
neck
.
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What hormone does the
thyroid gland
release?
The thyroid gland releases the hormone
thyroxine
.
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What are the two main effects of
thyroxine
in the body?
Thyroxine stimulates the body's
basal metabolic rate
and plays an important role in growth and development.
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How is the level of
thyroxine
in the blood controlled?
The level of thyroxine in the blood is controlled by
negative feedback
.
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What happens when the
thyroxine
level falls in the blood?
The
pituitary gland
releases the hormone
TSH
into the bloodstream.
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What does
TSH
trigger in the body?
TSH triggers the
thyroid gland
to release more
thyroxine
into the blood.
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What occurs when the
thyroxine
level increases in the blood?
The increased level of thyroxine is detected by the brain, preventing the
pituitary gland
from releasing
TSH
.
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What is a
negative feedback cycle
?
A negative feedback cycle is a process where an
increase
in a
substance
triggers events that
decrease
its level, and vice versa.
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What are examples of
negative feedback
cycles in the human body?
Control of
blood glucose
Menstrual cycle
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Where can students find questions on the
adrenal glands
,
thyroid gland
, and
negative feedback
?
Students can find questions in the vision workbook linked in the video.
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