Cell Transport 1
Cell Transport 2
Homeostasis & Body Systems 1
Homeostasis & Body Systems 2
100
List the levels of organization, starting from the smallest to the largest.
Cells, tissues, organs, organ systems, organism
100
List the 3 kinds of solutions that a cell could be in.
Isotonic, hypertonic, hypotonic
100
Define homeostasis.
The body's ability to maintain internal conditions within a healthy range.
100
Describe the function of the digestive & excretory system.
Digestive: breaks down food into usable nutrients and absorbs them into bloodstream
Excretory: filters blood and removes waste from the body
200
Explain what it means for a cell membrane to be semi-permeable.
The cell membrane allows some substances to enter or leave the cell but not others.
200
If a cell is in a solution with equal solute concentration inside and outside of the cell, what kind of solution is it in? (Answer and draw an example.)
Isotonic
200
What is a feedback loop?
A mechanism that works to return the body to a its normal internal state.
200
Describe the function of the nervous system.
Controls and coordinates body functions by transmitting signals (electrical and chemical) and processing information
300
Why don't plant cells burst like animal cells? What kind of solution might the plant cells be in?
Plant cells have a cell wall that maintains its structure. A hypotonic solution.
300
Compare and contrast diffusion and osmosis.
Compare: passive transport (no energy needed) from high to low concentration
Contrast: diffusion can occur with any type of molecule while osmosis is specifically with water
300
What causes a feedback loop to start?
Stimulus or a change in the environment
300
What usually results when an organism fails to maintain homeostasis?
The organism becomes ill or may die.
400
Why do plants wilt when their cells become dehydrated? Describe the movement of water in the cells and what solution they are in.
Plant cells are dehydrated because water is leaving the cells. The entire plant starts to wilt because the cells are no longer turgid (rigid and firm).
400
Describe the movement of water if a cell is in a hypertonic solution. Draw an example.
Water leaves the cell.
400
You are extremely cold. What does your body do in response to maintain homeostasis?
You start shivering. This helps to increase your body temperature.
400
What do the digestive, respiratory, circulatory, and excretory system have in common?
They all work together to maintain homeostasis.They transport needed substances around the body and remove waste products.
500
Describe the movement of water in this area. Explain why. The membrane is impermeable to sucrose.
Water moves from the right side of the u-tube (high concentration) to the left side (low concentration).
500
Describe the movement of water if a cell is in a hypotonic solution. Draw an example of a plant and animal cell.
Water enters the cell.
500
If a person's blood CO2 level becomes too high after exercising, what two systems might interact to restore homeostasis? And how might it restore balance?
Circulatory and respiratory systems. Increase the breathing rate.
500
Following the digestion of a large meal, nutrients, including glucose, are being actively absorbed from the small intestine into the body. What are the two body systems that are interacting and how?
Digestive and circulatory system: break down food and transport it via the bloodstream.