Musculoskeletal

Question 1

What is a second class lever?

Answer 1

A second class lever occurs when two forces are applied on one side of an axis.

• Resistance lies between the effort force and the axis of rotation
• Few examples in the human body (toe raises)

Question 2

What is a third class lever?

Answer 2

A third class lever occurs when two forces are applied on one side of an axis.

• The effort force lies closer than the resistance force
• Most levers in the human body are third class levers

Question 3

What is a first class level?

Answer 3

First class lever occurs when two forces are applied on either side of an axis.

Question 4

Open and closed pack positions for the vertebral column

Answer 4

Open packed: midway between flex ion and extension

Closed packed: maximal extension

Question 5

Tempomandibular

Open and closed packed positions

Answer 5

Open packed: jaw slightly open

Close packed: maximal recursion (jaw clenched) OR mouth maximally opened

Question 6

Sternoclavicular

Open and closed packed position

Answer 6

Open packed: arm resting by side

Closed packed: arm maximally elevated