The Human Skeleton
What are two main functions of the skeleton?
Support and Protection
This type of cell carries electrical messages throughout the body.
Nerve Cell
What type of muscle works without us thinking about it?
Involuntary Muscle
What is mixture where one substance dissolves evenly in another.
A Solution
What organ is the main site of gas exchange?
Lungs
What connects bones to other bones?
Ligaments
These cells are long and elastic, allowing the body to move.
Muscle Cells
What connects muscles to bones?
Tendons
In a solution, the substance that dissolves is called the ___.
Solute
What muscle helps us breathe by moving up and down?
Diaphragm
What is the scientific name for the upper arm bone?
Humerus
This cell has a tail that helps it swim to the egg.
Sperm Cell
What are the three types of muscle tissue?
Skeletal, smooth, and cardiac
In a solution, the substance that does the dissolving is called the ___.
Solvent
What gas do we breathe in, and what gas do we breathe out?
Inhale oxygen, exhale carbon dioxide
What type of joint allows movement in one direction only, like the elbow?
Hinge Joint
This plant cell absorbs water and minerals from the soil.
Root Hair Cell
Why do muscles often work in pairs?
One contracts while the other relaxes to move bones
This type of mixture has visible parts and can be easily separated.
Heterogenous mixture
What is the function of the trachea?
It carries air to and from the lungs
Name one bone disease caused by a lack of calcium or vitamin D.
Rickets or Osteoporosis
This plant cell controls the opening and closing of stomata.
Guard Cell
What type of muscles are involved in peristalsis?
Smooth muscle
The process used to separate a liquid from a solid using heat.
Evaporation (or distillation)
Which lung is smaller and why?
The left lung is smaller than the right lung because it needs to make space for the heart.