Download Chapter 7.3 Guided Reading

Name
Class
Date
7.3 & 7.4 Guided Reading
BUILD Vocabulary
Term
Definition
Movement of particles from an area of higher
concentration to an area of lower concentration
Facilitated diffusion
Solution with more solute than another solution
Solution with less solute than another solution
Isotonic
Diffusion of water through a selectively permeable
membrane
Protein channels that specifically allow water to
move across the cell membrane.
Endocytosis
The releasing of materials from a cell when a
vesicle fuses with the cell membrane.
Phagocytosis
Pinocytosis
Group of similar cells that perform the same job
Group of tissues that work together
Organ systems
Passive Transport
For Questions 1–4, write the letter of the correct answer on the line at the left.
1. Which of the following must be true for diffusion to occur?
A. There must be areas of different concentrations.
B. Special protein channels must always be available.
C. Molecules or particles must have different sizes.
D. Energy must be available.
2. Which term refers to the condition that exists when no net change in
concentration results from diffusion?
A. concentration
C. osmosis
B. randomness
D. equilibrium
3. Air has a higher concentration of oxygen molecules than does the cytoplasm of
your lung cells. Where in your lungs will there be a net increase of oxygen?
A. in the air breathed in
C. cells in the air breathed out
B. outside of the lung cells
D. inside of the lung cells
4. Which of the following statements tells how facilitated diffusion differs from
simple diffusion?
A. Particles move through cell membranes without the use of energy by cells.
B. Particles tend to move from high concentration to lower concentration.
C. Particles move within channel proteins that pass through cell membranes.
D. Particles tend to move more slowly than they would be expected to move.
5. In the table below, draw how each type of cell will look after being placed in a
hypertonic solution.
Appearance of Cells in a Hypertonic Solution
Plant Cells
Animal Cells
For Questions 6–8, match the situation with the result. Write the letter of the correct
answer on the line at the left.
Situation
Result
6. Cells are in a hypotonic solution.
A. The cells lose water.
7. Cells are in a hypertonic solution.
B. The cells gain water.
8. Cells are in an isotonic solution.
C. The cells stay the same.
Active Transport
9. What is the function of active transport in moving small molecules and ions across cell
membranes?
mbranes? Give an example.
10. How does ATP enable transport proteins to move ions across a cell membrane?
11. What are the proteins used in active transport called?
Multicellular Life
12. The levels of organization in a multicellular organism are cells, tissues, organs, and
organ systems.
Follow the directions.
1. Draw a red arrow from the drawing that shows the least complex level of organization
to the next most complex level of organization.
2. Draw a blue arrow to the next most complex level of organization.
3. Draw a green arrow to the most complex level of organization.
4. Label each picture with the correct level of organization.
Apply the Big idea
8. How do cells in a multicellular organism maintain homeostasis as compared to individual
cells maintaining homeostasis??
9. Explain what cell specialization means in multicellular organisms and give at least one
example.
13. Most sports drinks are isotonic in relation to human body fluids. Explain why athletes
should drink solutions that are isotonic to body fluids when they exercise rather than ones
that are hypotonic
otonic to body fluids (contain a greater proportion of water in comparison to
the fluids in and around human body cells).