B.1.4 -Joints and Levers in the Human Body

Front

What is a lever?

Back

A lever is a simple machine consisting of a rigid bar that rotates about a fulcrum and is used to transmit force.

Front

What acts as the lever arm in the human body?

Back

Bones act as the lever arm in the human body.

Front

What is the role of joints in the human body?

Back

Joints act as the fulcrum in the human body.

Front

What is an opposable thumb?

Back

An opposable thumb is a thumb that can be positioned opposite the fingers, allowing for grasping and manipulation of objects.

Front

What are the three classes of levers?

Back

The three classes of levers are: 1st Class Lever, 2nd Class Lever, and 3rd Class Lever.

Front

What is a first class lever?

Back

A first class lever is a lever where the fulcrum is located between the effort and the load.

Front

What is a second class lever?

Back

A second class lever is a lever where the load is located between the fulcrum and the effort.

Front

What is a third class lever?

Back

A third class lever is a lever where the effort is applied between the fulcrum and the load.

Front

Give an example of a first class lever in the human body.

Back

An example of a first class lever in the human body is the neck, where the skull pivots on the vertebrae.

Front

Give an example of a second class lever in the human body.

Back

An example of a second class lever in the human body is the calf muscle lifting the body when standing on tiptoes.