(R) Homeostasis Review

What transports substances around the body?

• Blood
• Sweat
• Tears
• Urine

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

• Fruits release ethylene gas as they ripen. Ethylene gas quickens the ripening process.

• 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

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

Homeostasis in the human body is often maintained by a: 

• neutral feedback loop 
• solar feedback loop
• positive feedback loop
• negative feedback loop

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 

Positive feedback is when the change caused by the stimulus is

• decreased
• non existant
• increased
• changes constantly

Which diagram represents an organ?

• #1
• #2
• #3
• #4

Which of the following are in the correct order?

• organ system, cell, organ, tissue, organism

• cell, organ, tissue, organ system, organism

• cell, tissue, organelle, organ system, organism

• cell, tissue, organ, organ system, organism

This feedback system amplifies a change until a desired outcome is reached.

• positive feedback system

• negative feedback system

• neutral feedback system

• self-monitoring feedback system

This is the term used to describe the normal range of a variable in an organism

• control center

• effector

• stimulus

• set point