2019 Unit 4 Exam: Homeostasis and feedback mechanisms

The maintenance of an organism’s internal environment is called:

• compensating
• homeostasis
• balancing
• routine

Positive feedback is when the change caused by the stimulus is

• decreased
• non existant
• increased
• changes constantly

Homeostasis

• allows for a wildly fluctuating internal environment
• is impossible in vertebrates
• is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation
• is the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation

Tags

NGSS.HS-LS1-3

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

• Positive Feedback Response
• Negative Feedback Loop 
• Homeostatic imbalance

When you are cold, you shiver and your blood vessels contract, which warms you up. When you are hot, you sweat and your blood vessels expand, which cools you down.  

• Positive Feedback Response
• Negative Feedback Loop 
• Homeostatic imbalance

If your urine is dark yellow, it means that your urine is too concentrated and you are dehydrated

• True
• False

What structure releases urine from the body?

• bladder
• ureter
• kidney
• urethra

What very important job do kidneys have?

• The filter urine
• To filter waste and excess fluid out of the blood
• To filter waste out of urine
• To produce blood

If glucose or ketones were present in a urine sample, this could be an indicator of what?

• Liver Damage

• Infection

• Diabetes Mellitus

• Kidney stones

Maintaining blood glucose is an example of:

• Negative feedback
• Positive Feedback