Muscle Contractions/Actions

A quick jerky response

• Twitch

• Tetanic

• Isotonic

• Isometric

A more steady response

• Twitch

• Tetanic

• Isotonic

• Isometric

produces movement in joints, muscle shortens, causing insertion to move towards origin

• Twitch

• Tetanic

• Isotonic

• Isometric

Concentric contraction ______ muscles

• shorten

• lengthen

muscles increase in length

• Twitch

• Isotonic

• Concentric

• Eccentric

Examples of isotonic exercises:

• skipping and jumping

• walking and running

• rumping jacks and handstands

• yoga and aquatic exercise

Answer explanation

no movement or shortening, but tension with muscle increases

• Isotonic

• Concentric

• Eccentric

• Isometric

Answer explanation

What type of muscle action is this?

• Abduction

• Adduction

• Flexion

• Extension

Answer explanation

AB- AWAY

What type of muscle action is this?

• Abduction

• Adduction

• Flexion

• Extension

Answer explanation

AD- TOWARDS

What type of muscle action is this?

• Abduction

• Adduction

• Flexion

• Extension

Answer explanation

Flexion- makes the angles between 2 bones smaller