Download Cells, Tissues, Organs, Systems and the Organism 1. There are two

Cells, Tissues, Organs, Systems and the Organism
1. There are two types of cells.
a. Eukaryotic cells are cells that have a nucleus.
Ex. muscle cells
b. Prokaryotic cells are cells that do not have a nucleus.
Ex. most bacteria cells
2. Organisms have an organization of cells that help them to survive.
a.
b.
c.
d.
Cells are the basic unit of life.
Tissues are groups of cells working together to perform a function.
Organs are groups of tissues that work together.
Organisms are groups of organ systems working together.
There are two types of organisms.
Unicellular organisms are made up of only one cell. (uni means one)
Multi-cellular organisms are made up of many cells. (mulit means more than
one)
3. There are many types of organ systems.
a. The circulatory system is designed to carry oxygen to all parts of the body.
(Major organ is the heart.)
b. The digestive system is designed to take in food and turn it into energy that the body
can use. (Major organ is the stomach.)
c. The respiratory system is used to breathe in oxygen from the air and breathe out
carbon dioxide from the body.
(Major organ is the lung.)
d. The integumentary system is made up of skin. It is used to protect the body from
infection and to keep the body from losing water.
(Major organ is the skin.)
e. The immune system is used to fight any diseases or viruses that are in the body.
(Major organ is the bone marrow, which makes white blood cells.)
f. The endocrine system is in charge of releasing the chemicals needed to make the body
function.
(Major organs are the glands.)
g. The skeletal system is needed to support the body and protect the organs inside the
body.
(Major organs are the bones.)