Download Hour - Hartland High School

Name____________________________________________________ date ______ Hour_______
Chapter 7.2, 8.1, 37.3 Review
1. Draw a water molecule. Label the oxygen and hydrogen. Draw a positive and negative signs above
the appropriate element.
(+) Positive End
(-) Negative End
a. What does polarity mean?
Means that one end is more positive (Hydrogen) and one end is more negative (Oxygen)
b. How does this affect the behavior of water molecules when they come in contact with each other?
Polarity allows water molecules to form weak attractions between one water molecule and
another water molecule called hydrogen bonds.
NOT THE SAME AS COVALENT BONDS WHICH IS HOW ONE INDIVIDUAL WATER
IS HELD TOGETHER
c. When it rains, water droplets cling to each other to form larger droplets. What property of water
does this describe? ____COHESION______
d. Dropping water onto a penny and it remaining above the rim of the penny and when you floated a
paper clip on the surface of water illustrate which property of water?__Surface Tension______
e. Water moves up the small tubes within a tree trunk. What property of water does this describe?
___CAPILLARY ACTION______
2. Label the following parts: Fatty acid chains, channel protein, Phosphate group, cholesterol,
Polar end, nonpolar end.
3. a) How does the plasma membrane maintain homeostasis? Use the terms “selectively permeable”
and “diffusion or diffuses” in your answer.
The plasma membrane is selectively permeable which means that it allows only some things in
(food, water, etc.) and keeps others out (wastes, invaders, etc.). Water moves across the PM by
diffusion from an area of high concentration to low concentration.
b) What is the kidney’s role in maintaining homeostasis?
The kidneys filter out wastes in the blood like urea, medications, salts, etc. and create urine to
be excreted from the body. It does this by using active transport (low to high). By doing this we
can keep our blood clean and our body in homeostasis.
4. What three factors affect the rate of diffusion? _____Concentration________,
____Temperature_____, and ___Pressure_____
5. If a person has a high concentration of glucose in their blood, some of the glucose can diffuse into the
urine. What disorder can this cause this? _____diabetes___________
6. a) What is a concentration gradient? Area separated by unequal concentrations, one area is high
concentration and one is lower concentration.
b) Some cells need to have a higher concentration of a certain ion or molecule inside the cell then
outside the cell. This happens in the liver because it contains a high glucose concentration and more
keeps getting pumped in. for storage. This requires energy to keep the ions or molecules moving
against their concentration gradient.
What type of transport goes against the concentration gradient? _____Active____________
7. Osmosis is a specific type of diffusion that involves only the movement of ___water_______.
8. Describe the role of the kidney and nephron.
The nephron is the functional unit of the kidney that forms urine and does filtration and
reabsorption. Filtration removes all of the bad things from our blood and reabsorption takes back
all of the stuff that our body still needs and does not allow them to be excreted in the urine.
9. Describe the pathway that urine takes from its creation to its eventual exit.
Kidney
ureter
urinary bladder
urethra
10. There are two types of transport across the cell membrane, Passive and Active.
Create a graphic organizer or a chart that includes the two types, what type of particles are moving across
the membrane, whether it uses energy or not, what type of proteins (if any) are used in the process,
Type of Transport
Passive
Active
Particles Moved
Water, lipids, Sugars,
and Amino Acids
Proteins and other Large
Molecules
Energy or Not
NO ENERGY
Type of Proteins
Channel and Carrier
ENERGY REQUIRED
Carrier