Homeostasis Quiz

Which of the following is a good definition of homeostasis?

• Homeostasis means that our body monitos the value of several parameters and prevents them from ever changing.

• Homeostasis means that our body doesn't regulate the value of different body parameters.

• Homeostasis means that our body maintains a relatively constant internal environment that often incorporates a form of feedback regulation.

• Homeostasis means that we stand still all the time.

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Which of the following variables do our bodies regulate:

• Glucose concentration in blood

• Body temperature

• Blood volume (how much blood is in our body at one time)

• All of the above

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What type of feedback loop is shown?

• Positive

• Ngeative

• Neutral

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which of the following is an example of positive feedback to indirectly maintain homeostasis?

• the chemical reactions involved in blood clotting

• your blood vessels dilate and you begin to sweat in response to elevated body temperature

• your blood vessels constrict and you begin to shiver in response to low body temperature

• your coach compliments you on your performance in practice

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When glucose levels in the blood rise, your brain sends a signal to your pancreas. The pancreas releases insulin, which opens channels in cell membranes to allow glucose to enter the cell, lowering blood sugar levels. This is an example of...

• Positive Feedback

• Negative Feedback

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True or False: Negative feedback loops are bad for the human body.

• True

• False

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When you get cut, your skin releases hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop the bleeding. The hormone signals continue until the cut is closed. This is an example of....

• Positive feedback mechanism

• Negative feedback mechanism

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Most control mechanisms in the human body are ______________________ mechanisms.

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Positive feedback is when the change caused by a stimulus is....

• increased

• decreased

• non-existent

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Childbirth is an example of _______________ feedback.