The Skeletal System - Biology with Ms. Murillo

The Skeletal System:
The main organs of the skeletal system are the _bones___. Bones work with muscles to _move____,
_protect____, and __support____ sensitive internal organs.
Evolution of the Skeletal/Muscular Systems:
Type of support
Have muscles surrounding a fluidfilled cavity. When contracted, they
push against the fluid and cause the
body to change shape.
A hard external skeleton,
made of chitin and is
continually shed as the
organism grows - molting
Have a well developed
Endoskeleton or
internal skeleton
made of calcified plates.
Picture of
Annelids (worms) and Jellyfish
Arthropods (Insects) and
mammals, birds, reptiles,
fish, amphibians
Characteristics and Structures:
a. Bones are attached to other bones with special connective tissues known as _ligaments__.
b. A place where one bone attaches to another is called a _joints___.
c. Bones are a living part of your body that contain _nervous____ tissue to send and receive
information, as well as blood vessels to bring the nutrients___ and _oxygen___ gas that is
necessary for the bones’ health and growth.
d. Bone is composed of _____2_____ types of tissue:
i. _Spongy___: soft, interior layer of bone tissue.
1. Site of _red blood cell__ production.
2. Less dense
3. Contains ___bone marrow____
ii. __Compact__ :outer layer of tissue surrounding bone
1. Stores minerals – ___calcium____
2. Extremely dense and strong
e. Bone marrow_______ is found inside of bones. This tissue is responsible for creating new
__blood___ cells in animals. These cells are a vital part of the _Circulatory______ system.
Organization of Life: Skeletal System
Skeletal Body System Interactions:
a. ___Circulatory System___: bones help produce new blood cells in addition to storing
minerals transported by the circulatory system.
b. __Muscular System____: bones and muscles work together to enable body movement and
provide support.
c. ___Nervous___: bones protect many vital organs of the nervous system – Skull (brain),
Vertebrae (spinal cord).