Download Homeostasis and Cells (7.4) page 214 – 217 The diversity of life is

Homeostasis and Cells (7.4)
page 214 – 217

The diversity of life is so great that sometimes we may need to remind ourselves that all living things are made of
___________________________; they all have the same basic ___________________ ________________________,
and even contain the same _________________________.

Differences arise from the ways cells are _________________________________ and the ways they associate with
other cells to make _______________________ _____________________.
o
What does SPECIALIZED mean?
The Cell as an Organism

What do we call single-celled organisms? __________________________
o
Provide ONE example of a single-celled organism: _________________________
o
What is HOMEOSTASIS? __________________________________________________
_______________________________________________________________________.

To maintain _____________________, single-celled organisms _________________, respond to the
___________________________, transform ______________________________, and _______________________.

Single-celled organisms include both __________________________________ cells like bacteria and
_________________________________________________ (plant or animal) cells.
Multicellular Life

Unlike most single-celled organisms, the cells of humans and other _______________________ organisms do not live
on their own. They are _____________________________________.

What does INTERDEPENDENT mean? _______________________________________________
_____________________________________________________________________________.

The cells of multicellular organisms are ________________________________, with different cells types playing
different roles.
o
Give examples of different functions in YOUR body that are performed by different types of cells.
____________________________________________________________
________________________________________________________________________
________________________________________________________________________
_______________________________________________________________________.
Look at the microscope pictures on page 215 and read the descriptions of Human Trachea Cells and Pine Pollen to complete
the table below.
Specialized Animal Cells: Human Trachea Epithelium
Question 1: What do you think the long, wispy
projections on the surface of the cell are for?
Answer:
Question 2: Why do you think these cells need
many mitochondria? What powerful action is
energized by the mitochondria?
Answer:
Specialized Plant Cells: Pine Pollen
Question 1: What would happen to tree populations
if plants didn’t have light-weight pollen cells that
allow for fertilization?
Answer:
Question 2: What part of the pollen cell is
responsible for the light-weight organization of
pollen?
Answer:

The specialized cells of multicellular organisms are organized into __________________________, then into
___________________, and finally into _______________________________________.
o
Define Tissue: ______________________________________________________________
__________________________________________________________________________.
o
Define Organ: ______________________________________________________________
__________________________________________________________________________.
o
Define Organ System: ________________________________________________________
__________________________________________________________________________.
o

This division of labor among cells allows the organism to maintain ____________________.
Cells in a large organism communicate by means of ______________________________________ that are passed
from ______________ cell to ______________________________.

These cellular signals can ___________________________ or __________________________ the
_____________________________________ of the cells that receive them.
To Complete this assignment:
Look at the Data Graph below and read the description provided about mouse mitochondria and energy. Answer the questions
below the graph.
1.
What approximate percentage of cell volume in the mouse liver is composed of mitochondria?
2.
There are 4 chambers in the mouse heart; right and left ventricles and right and left atria. Based on the data
given, which chamber shown pumps more blood from the heart to the rest of the body? Explain your reasoning.
7.4 Assessment

The contractile vacuole is an organelle found in a unicellular paramecia (free-living in the water). This contractile
vacuole pumps out fresh water that fills the inside of the organism by osmosis. Explain how this pumping ability is
an example of maintaining homeostasis.

Using what you know about muscle movement, what organelles would be most common in muscle cells and why?