Homeostasis

What transports substances around the body?

• Blood
• Sweat
• Tears
• Urine

Homeostasis in the human body is often maintained by a: 

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

Positive feedback is when the change caused by the stimulus is

• decreased
• non existant
• increased
• changes constantly

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 

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 

Which is the largest structure?

• Cells
• Tissue
• Organ
• Organism

Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

The term for maintaining internal temperature is: 

• Thermoregulation
• Thermometer
• Homeothermal
• Homeostasis

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

Which system sends electrical messages that helps control the body's responses to internal and external changes?

• nervous
• endocrine
• reproductive
• integumentary