Science Review 7th grade

How can the lever be balanced?

• add weight to the right side

• move the fulcrum right

• move the heavier weight back

What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

All of these are examples of a wheel and axle except:

• pizza cutter

• windmill

• doorknob

• lever

The job of the heart is to . . .

• pump blood around the body.

• send food to the small intestines.

• break down food.

• give energy to the body.

A ramp is an example of a(n)

• inclined plane

• lever

• force

• fulcrum

The circulatory system works with the ___________ system to provide our body with oxygen.

• respiratory

• skeletal

• muscular

• digestive

In this illustration,

• the machine is decreasing mechanical advantage

• mechanical advantage is not changed

• the machine is increasing mechanical advantage

The main function of the circulatory system is

• To give the body structure and support

• to transport messages from the body to the brain

• transport blood, nutrients, and gases throughout the body

• Excrete waste