Y9 Homeostasis

Which main systems are involved in maintaining homeostasis?

• Circulatory and excretory systems

• Muscular and skeletal systems

• Nervous and endocrine

• Nervous and respiratory

What are the types of feedback mechanisms in homeostasis?

• Internal and external feedback

• Direct and indirect feedback

• Positive and negative feedback

• Primary and secondary feedback

What is the aim of the stimulus-response model?

• To balance internal stimuli and organism responses

• To stimulate the body's internal state to respond to external changes (maintain homeostasis)

• To co-ordinate internal stimuli and cellular responses (reverse honeostasis)

• To reverse external stimuli and cellular responses

What is homeostasis?

• The ability of an organism to maintain a stable internal environment

• The ability of an organism to reproduce efficiently

• The ability of an organism to grow rapidly

• The ability of an organism to adapt to changing external conditions

How does the body regulate its temperature when the external temperature increases?

• By decreasing heart rate

• By sweating

• By increasing heart rate

• By shivering

If the environment gets cold, we will often shiver in order to:

• keep body temperature the same as the external temperature
• decrease body temperature
• increase body temperature
• regulate blood pressure

The "cause" for something to happen is the

• response
• effect
• stimulus
• homeostasis

The "effect" of a given stimulus is the...

• response
• stimulus
• cause
• result

Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

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. 

• Positive Feedback Response
• Negative Feedback Loop