6.6 Hormones and Homeostasis

Which is the best definition of homeostasis?

• The process by which organisms maintain a relatively stable internal environment
• The process by which organisms adapt to their environment
• The process by which organisms reproduce
• The process by which organisms evolve over time

In homeostasis, a shift away from the desired level results in a series of events which return the condition (e.g. blood glucose) back to the desired level. This mechanism is called...

Where is insulin produced?

• alpha cells in pancreas

• beta cells in pancreas

• adipose tissue

• hypothalamus

• pineal gland

Where is glucagon produced?

• alpha cells in pancreas

• beta cells in pancreas

• adipose tissue

• hypothalamus

• pineal gland

Where is leptin produced?

• alpha cells in pancreas

• beta cells in pancreas

• adipose tissue

• hypothalamus

• pineal gland

Where is melatonin produced?

• alpha cells in pancreas

• beta cells in pancreas

• adipose tissue

• hypothalamus

• pineal gland

When blood glucose levels increase, ​ (a)   is released from ​ (b)   cells in the ​ (c)   .

• insulin
• beta
• pancreas
• glucagon
• alpha
• liver
• leptin
• adipocyte
• adipose tissue

When blood glucose levels decrease, ​ ​​ (a)   is released from ​​ (b)   cells in the ​ (c)   .

• insulin
• beta
• pancreas
• glucagon
• alpha
• liver
• leptin
• adipocyte
• adipose tissue

A hormone is a ​ (a)   , secreted by a(n) ​ (b)   , which is transported by the ​ (c)   and has an effect on the ​ (d)   before being destroyed by the ​ (e)   .

• chemical messenger
• gland
• blood
• target organ
• MTR
• pancreas
• liver
• brain
• neurons
• kidneys

Produced by pancreatic beta cells.

• Insulin

• Glucagon

• Thyroxin

• Leptin

• Melatonin