Homeostasis and Stimulus-response

Define stimulus.

• Change in an organism’s environment that causes it to react.

• How the organism reacts to the stimulus.

What is the name of the receptor that detect the rise and fall of body temperature?

• Thermoreceptor
• Osmoreceptor
• Baroreceptor
• Chemoreceptor

When the body temperature drop below normal ranges, arterioles in the skin will

• dilate to allow less blood to flow to skin surface

• constrict to allow less blood to flow to skin surface

• dilate to allow more blood to flow to skin surface

• constrict to allow more blood to flow to skin surface

This graph shows an example of...

• Blood sugar regulation

• Homeostasis

• Negative feedback

• Positive feedback

Which of the following is not regulated by homeostasis?

• body temperature

• blood sugar

• blood pH

• body movements

Which of the following is an example of positive feedback?

• Thermoregulation

• Blood Pressure

• Childbirth

• Blood Sugar Levels

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

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 

Which body system controls the body to maintain homeostasis?

• excretory

• nervous

• circulatory

• skeletal

Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop