Muscular System

A isometric contraction......

• Is the muscle shortening.

• Is the muscle lengthening.

• Produces the least amount of force.

• Muscle length remains unchanged.

Which of the following is not a dynamic muscular contraction?

• Isokinetic

• Eccentric

• Isometric

• Concentric

The _____ is responsible for initiating all muscular actions, and the spinal cord carries all of its messages.

Henneman principle, which is also known as the size principle states....

• The recruitment of motor units within a skeletal muscle commences with small motor units to large motor units.

• the recruitment of motor units within a skeletal muscle commences with small motor units to small motor units.

• the recruitment of motor units within a skeletal muscle commences with Large motor units to small motor units.

• the recruitment of motor units within a skeletal muscle commences with large motor units to large motor units.

Longer muscle fibers are generally......

• Very Powerful

• Very powerful and quick

• Somewhat powerful.

• Not powerful, but quick contractile velocities.

_______ muscle fibre arrangements generate the most force, because they are packed with the most muscle fibres in their cross-sectional area.

What is number "1' on the diagram?

• Tendon

• Muscle

• Ligament

• Bone

What is number "2" on the diagram?

• Bone

• Muscle

• Tendon

• Ligament

What is number "5" on the diagram?

• Bone

• Muscle fibre

• Fasiculi

• Tendon

Small motor units.....

• Are used for forceful contractions.

• Recruited last.

• Use for small and precise movements.

• Recruited last and are used for powerful movements.