Homeostasis Lab 1 Exam with correct detailed solutions || || || || || || ||
How does the body know these external things are happening? - ✔✔The body knows these
|| || || || || || || || || || || || || || ||
external things are happening due to the control system as a stimulus is presented it causes
|| || || || || || || || || || || || || || || ||
the body to have negative feedback as it tries to maintain homeostasis.
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Why is it necessary to keep the body at a certain temperature to protect from UV radiation?
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- ✔✔It is important to keep the body at a certain temperature because if the body exceeds a
|| || || || || || || || || || || || || || || || || ||
certain temperature an athlete may go into heat exhaustion or possible heat stroke. It is
|| || || || || || || || || || || || || || ||
equally important to protect the body from UV radiation
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Why does the athlete's body release adrenaline (epinephrine) before the race has even
|| || || || || || || || || || || || ||
started? - ✔✔When the heart rate increases before the race, more blood is being pumped
|| || || || || || || || || || || || || || ||
which is giving the athlete more fuel causing adrenaline (epinephrine) to enter the
|| || || || || || || || || || || || ||
bloodstream
Once the race has started, the first changes we see are increased heart rate and blood
|| || || || || || || || || || || || || || || ||
pressure. What is the purpose of this rapid increase in blood flow? - ✔✔The heart rate and
|| || || || || || || || || || || || || || || || ||
blood pressure increased after the race started due to the muscles working and need more
|| || || || || || || || || || || || || || ||
oxygen in result produced more waste gas. Oxygen supply from the lungs is involved means
|| || || || || || || || || || || || || || ||
more work for the lungs and also more blood needed to carry oxygen to the muscles, the
|| || || || || || || || || || || || || || || || ||
heart has to work harder making the heart beat more quickly and the heart rate increases.
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How does the body increase its oxygen supply? - ✔✔Oxygen supply from the lungs is
|| || || || || || || || || || || || || || ||
involved resulting in more work for the lungs due to the muscles needing more oxygen as a
|| || || || || || || || || || || || || || || || ||
lot of waste gas has been produced.
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Why do the runners look flushed only 20 minutes into the race? - ✔✔As the body heats up
|| || || || || || || || || || || || || || || || || ||
due to running it causes the body temperature to increase and as a result the body can begin
|| || || || || || || || || || || || || || || || ||
to stop functioning if the temperature reaches a dangerously high temperature.
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, The runners take regular drinks of glucose and water. What do these two substances do for
|| || || || || || || || || || || || || || || ||
the body during the race? - ✔✔During the race, the water and glucose help the body as it
|| || || || || || || || || || || || || || || || || ||
helps to replenish the water that has been lost due to sweating. The glucose helps to give
|| || || || || || || || || || || || || || || || ||
the body carbs which turns into energy.
|| || || || || ||
Using the regulation of blood glucose as an example, explain what is meant by a negative
|| || || || || || || || || || || || || || || ||
feedback system. A flow diagram or an everyday example may help you. - ✔✔Blood sugar
|| || || || || || || || || || || || || || ||
regulation: insulin lowers blood glucose when levels are high, but glucagon helps to
|| || || || || || || || || || || || ||
increase blood glucose levels when they have become too low. Therefore the control of
|| || || || || || || || || || || || || ||
blood sugar by insulin is a negative feedback system.
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What changes did you observe in each of the parameters you recorded? - ✔✔As exercise
|| || || || || || || || || || || || || || ||
time increased bpm also increased until the time reached 8 minutes of exercise. It then
|| || || || || || || || || || || || || || ||
decreased from 8 minutes of exercise to 10 minutes after exercise. For student 1 the
|| || || || || || || || || || || || || || ||
respiratory rate started to increase with the amount of time. but as soon as Student 1
|| || || || || || || || || || || || || || || ||
reached 8 minutes their heart rate began to decrease. On the contrary, Student 2's
|| || || || || || || || || || || || || ||
respiratory rate increased throughout the entirety of exercise decrease, but then fluctuated
|| || || || || || || || || || || ||
between 97.6-97.4 until post-exercise measurements were taken. For Student 2, the
|| || || || || || || || || || ||
temperature began to decrease but then increased as the exercise and rest went on.
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Explain why you saw the changes you did in body temperature. - ✔✔As the students
|| || || || || || || || || || || || || || ||
continues to exercise, their body temperatures decreased for the most part. When the
|| || || || || || || || || || || || ||
student stopped and began to rest, their body temperature increased. The body is trying to
|| || || || || || || || || || || || || || ||
remain in homeostasis. || ||
Explain the homeostatic mechanisms that caused the changes you saw in heart rate and
|| || || || || || || || || || || || || ||
breathing rate. - ✔✔Sweat, movement, blood flow || || || || || || ||
The homeostatic mechanism that caused the changes in heart rate and breathing rate is
|| || || || || || || || || || || || || ||
exercising. As a result of exercising (the stimulus), one of the internal variables is changed.
|| || || || || || || || || || || || || || ||
When one variable is changed, the body sends out a signal to be detected so the body will
|| || || || || || || || || || || || || || || || || ||
respond and carry out homeostasis. || || || ||
How does the body know these external things are happening? - ✔✔The body knows these
|| || || || || || || || || || || || || || ||
external things are happening due to the control system as a stimulus is presented it causes
|| || || || || || || || || || || || || || || ||
the body to have negative feedback as it tries to maintain homeostasis.
|| || || || || || || || || || ||
Why is it necessary to keep the body at a certain temperature to protect from UV radiation?
|| || || || || || || || || || || || || || || || ||
- ✔✔It is important to keep the body at a certain temperature because if the body exceeds a
|| || || || || || || || || || || || || || || || || ||
certain temperature an athlete may go into heat exhaustion or possible heat stroke. It is
|| || || || || || || || || || || || || || ||
equally important to protect the body from UV radiation
|| || || || || || || ||
Why does the athlete's body release adrenaline (epinephrine) before the race has even
|| || || || || || || || || || || || ||
started? - ✔✔When the heart rate increases before the race, more blood is being pumped
|| || || || || || || || || || || || || || ||
which is giving the athlete more fuel causing adrenaline (epinephrine) to enter the
|| || || || || || || || || || || || ||
bloodstream
Once the race has started, the first changes we see are increased heart rate and blood
|| || || || || || || || || || || || || || || ||
pressure. What is the purpose of this rapid increase in blood flow? - ✔✔The heart rate and
|| || || || || || || || || || || || || || || || ||
blood pressure increased after the race started due to the muscles working and need more
|| || || || || || || || || || || || || || ||
oxygen in result produced more waste gas. Oxygen supply from the lungs is involved means
|| || || || || || || || || || || || || || ||
more work for the lungs and also more blood needed to carry oxygen to the muscles, the
|| || || || || || || || || || || || || || || || ||
heart has to work harder making the heart beat more quickly and the heart rate increases.
|| || || || || || || || || || || || || || ||
How does the body increase its oxygen supply? - ✔✔Oxygen supply from the lungs is
|| || || || || || || || || || || || || || ||
involved resulting in more work for the lungs due to the muscles needing more oxygen as a
|| || || || || || || || || || || || || || || || ||
lot of waste gas has been produced.
|| || || || || ||
Why do the runners look flushed only 20 minutes into the race? - ✔✔As the body heats up
|| || || || || || || || || || || || || || || || || ||
due to running it causes the body temperature to increase and as a result the body can begin
|| || || || || || || || || || || || || || || || ||
to stop functioning if the temperature reaches a dangerously high temperature.
|| || || || || || || || || || ||
, The runners take regular drinks of glucose and water. What do these two substances do for
|| || || || || || || || || || || || || || || ||
the body during the race? - ✔✔During the race, the water and glucose help the body as it
|| || || || || || || || || || || || || || || || || ||
helps to replenish the water that has been lost due to sweating. The glucose helps to give
|| || || || || || || || || || || || || || || || ||
the body carbs which turns into energy.
|| || || || || ||
Using the regulation of blood glucose as an example, explain what is meant by a negative
|| || || || || || || || || || || || || || || ||
feedback system. A flow diagram or an everyday example may help you. - ✔✔Blood sugar
|| || || || || || || || || || || || || || ||
regulation: insulin lowers blood glucose when levels are high, but glucagon helps to
|| || || || || || || || || || || || ||
increase blood glucose levels when they have become too low. Therefore the control of
|| || || || || || || || || || || || || ||
blood sugar by insulin is a negative feedback system.
|| || || || || || || ||
What changes did you observe in each of the parameters you recorded? - ✔✔As exercise
|| || || || || || || || || || || || || || ||
time increased bpm also increased until the time reached 8 minutes of exercise. It then
|| || || || || || || || || || || || || || ||
decreased from 8 minutes of exercise to 10 minutes after exercise. For student 1 the
|| || || || || || || || || || || || || || ||
respiratory rate started to increase with the amount of time. but as soon as Student 1
|| || || || || || || || || || || || || || || ||
reached 8 minutes their heart rate began to decrease. On the contrary, Student 2's
|| || || || || || || || || || || || || ||
respiratory rate increased throughout the entirety of exercise decrease, but then fluctuated
|| || || || || || || || || || || ||
between 97.6-97.4 until post-exercise measurements were taken. For Student 2, the
|| || || || || || || || || || ||
temperature began to decrease but then increased as the exercise and rest went on.
|| || || || || || || || || || || || ||
Explain why you saw the changes you did in body temperature. - ✔✔As the students
|| || || || || || || || || || || || || || ||
continues to exercise, their body temperatures decreased for the most part. When the
|| || || || || || || || || || || || ||
student stopped and began to rest, their body temperature increased. The body is trying to
|| || || || || || || || || || || || || || ||
remain in homeostasis. || ||
Explain the homeostatic mechanisms that caused the changes you saw in heart rate and
|| || || || || || || || || || || || || ||
breathing rate. - ✔✔Sweat, movement, blood flow || || || || || || ||
The homeostatic mechanism that caused the changes in heart rate and breathing rate is
|| || || || || || || || || || || || || ||
exercising. As a result of exercising (the stimulus), one of the internal variables is changed.
|| || || || || || || || || || || || || || ||
When one variable is changed, the body sends out a signal to be detected so the body will
|| || || || || || || || || || || || || || || || || ||
respond and carry out homeostasis. || || || ||
