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The pancreas releases insulin when:

• Stress hormones rise

• Blood glucose levels get low

• A person exercise

• Blood glucose levels rise after eating

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Blood sugar regulation is an example of

• negative feedback

• positive feedback

• neutral feedback

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What will most likely occur when a cell is placed into a saline solution that has a higher salt concentration than inside the cell?    

• Water molecules will move into the cell
• Salt molecules will move out of the cell 
• Salt molecules will move until the salt concentration is the same inside and outside the cell 
• Water molecules will move until the salt concentration is the same inside and outside of the cell.

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Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 

• Line A

• Line B

• Line C

• Line D

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Body temperature regulation is an example of a ______________ loop

• positive

• negative

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If the environment gets cold, we will often shiver in order to:

• keep body temperature the same as the external temperature
• decrease body temperature
• increase body temperature
• regulate blood pressure

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According to the myogenic mechanism, if blood pressure is high...

• Muscles in the glomeruli contract

• Muscles in the glomeruli relax

• The amount of salt in renal tubules increases

• The amount of salt in renal tubules decreases

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What is the main function of the endocrine system?

• It creates chemicals, or hormones, that are sent around the body to maintain homeostasis.

• It creates electrical messages that are sent around the body to maintain homeostasis.

• It maintains the correct level of oxygen in the body to maintain homeostasis.

• It releases waste from the body to maintain homeostasis.

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Insulin is released in response to:

• low blood glucose levels

• low blood calcium levels

• high blood glucose levels

• high blood calcium levels

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The pancreas produces _____ when your blood sugar level is high.

• Thyroxin

• Melatonin

• Glucagon

• Insulin

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