Homeostasis and Feedback Mechanisms

Multiple Choice

What is homeostasis?

• allows for a wildly fluctuating internal environment
• is impossible in vertebrates
• is the maintenance of a relatively stable internal environment

• is the maintenance of a relatively stable external environment

Match

Match the following components of a feedback mechanism.

• Stimulus

• Receptor

• Control Center

• Effector

External change

Detects change and sends a message

Receives message & coordinates response

Structure that responds to message

• External change

• Detects change and sends a message

• Receives message & coordinates response

• Structure that responds to message

Multiple Choice

What is the body system that sends and recieves electrical signals from the brain?

• Skeletal System
• Nervous System
• Muscular System
• Digestive System

Multiple Choice

How does the muscular system and the skeletal system work together?

• The muscular system allows the body to stand up while the skeletal system allows the body to move
• The muscular system allows the body to move and the skeletal system gives the body a structure 
• The muscular system gives the body nutrients while the skeletal system gives the body blood
• The skeletal system makes cells whilte the muscular system eats them.

Multiple Choice

How does the cardiovascular system and the respiratory system work together?

• The cardiovascular system transports oxygen around the body while the respiratory system gives the body oxygen

• The cardiovascular system makes cells while the respiratory system moves them where they are suppose to go.

• The cardiovascular system allows the body to have energy while the respiratory system makes cells

• The cardiovascular system transports nutrients around the body while the respiratory system brings oxygen into the body

Multiple Choice

The two types of feedback systems that help organisms maintain homeostasis are:

• positive and negative 
• receptor and effector
• static and dynamic
• minor and major

Multiple Choice

Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

Multiple Choice

In a positive feedback loop, each action creates a consequence that _____________________ the other action.

• decreases

• has no effect on

• amplifies

Multiple Choice

In a negative feedback loop, each action creates a consequence that _____________________ the other action.

• decreases

• has no effect on

• amplifies

Multiple Choice

When glucose levels in the blood rise, your brain sends a signal to your pancreas. The pancreas releases insulin, which opens channels in cell membranes to allow glucose to enter the cell, lowering blood sugar levels. This is an example of a:

• Negative Feedback Loop

• Positive Feedback Loop

Multiple Choice

What is homeostasis?

• A process to increase body temperature

• A process to decrease body temperature

• A process to maintain a constant internal environment

• A process to regulate blood pressure

Multiple Choice

What is the stimulus in the blood clotting model?

• Clotting occurs from platelets

• Break or tear in blood vessel wall

• Clotting proceeds until break is sealed by clot

• Released chemicals attract more platelets.

Multiple Choice

What is the response in the blood clotting model?

• Clotting occurs from platelets

• Break or tear in blood vessel wall

• Clotting proceeds until break is sealed by clot

• Released chemicals attract more platelets.

Multiple Choice

What type of feedback is shown in the blood clotting model?

• Positive

• Negative

Multiple Choice

According to the model, what is a normal blood glucose (sugar) level?

• 270 mg/100mL

• 180 mg/100 mL

• 45 mg/100 mL

• 90 mg/100 mL

Multiple Choice

According to the model, what is the response to HIGH blood glucose (sugar)?

• Pancreas releases insulin into blood

• Pancreas releases glucagon into blood

Multiple Choice

According to the model, what is the response to LOW blood glucose (sugar)?

• Pancreas releases insulin into blood

• Pancreas releases glucagon into blood

Multiple Choice

With low oxygen levels, your breathing rate will increase. When your oxygen levels rise, what is the appropriate response?

• stop breathing

• increase heart rate

• keep breathing rate high

• return breathing rate to baseline