Homeostasis & Diffusion
What is homeostasis?
Maintaining a relatively stable internal environment
What is a feedback loop?
Stability of the internal environment using mechanisms to make it stable.
True or false:
All systems work together in the human body.
True
Where is groundwater stored?
Aquifers.
What is eutrophication?
The process by which a body of water becomes enriched in dissolved nutrients.
How is the cell membrane relative to homeostasis?
Regulates movement of in and out of the cell?
What are the two types of feedback loops?
Positive and negative feedback loops.
How does the circulatory system work?
What are the four major areas of water storage on Earth?
Atmosphere, surface water, groundwater, and the ocean.
What does eutrophication cause?
Additional growth in aquatic plant life.
What is the difference between passive and active transport?
Passive: high —> low concentration (does not require energy)
Active: low —> high concentration (requires energy)
What happens to homeostasis when there is a mistake in the feedback loop?
Homeostasis is thrown off.
How do the circulatory and respiratory systems work together?
The respiratory brings in oxygen, and the circulatory system carries it throughout the body.
What organisms break down wastes and other dead organisms to recycle carbon?
Fungi, bacteria, and worms.
What does the growth in aquatic plant life typically result in?
A depletion in the dissolved oxygen in the water?
What does equilibrium mean?
The concentration of the solute is the same throughout the solution.
What is the difference between a positive and negative feedback loop?
Positive: the output intensifies the response
Negative: the output uses a counter response to return the levels to a set point
How does the nervous system interact with all other systems?
Collects, processes, and responds to sensory information ; controls voluntary and involuntary actions.
What is the only form of nitrogen that non-legume plants can take in and use to recycle?
Nitrates.
What is a dead zone?
The areas in the water where dissolved oxygen levels are so low that marine life is unable to survive.
What three things affect the rate of diffusion?
Temperature, concentration, and molecule size.
What four things do all feedback loops have?
Organize the levels of organization leading up to organ systems.
Atom, molecule, cell, tissue, organ, organ system.
What effect would a decrease in nitrifying bacteria have on the nitrogen cycle?
What can a dead zone be caused by?
Temperature increase in waters, fresh water and salt water meeting, and human pollution (like runoff).