Musculoskeletal System

What is the major muscle that raises the arm to the horizontal position shown in the image?

• Trapezius

• Pectoralis major

• Deltoid

• Latissimus dorsi

Name the type of muscle contraction required to hold the weight for a few seconds with the arms in the horizontal position on the right

• Isointerial

• Concentric

• Eccentric

• Isometric

Which of the following are voluntary muscles?

• Smooth

• Cardiac

• Heart

• Skeletal

Which of the following is an example of a convergent muscle arrangement?

• Rectus Abdominis

• Tricep Brachii

• Pectoralis Major

• Gastrocnemius

Which of the following is not true regarding pennate muscles?

• Unipennate muscles have fibres running down one side of the tendon eg Gastrocnemius

• Bipennate muscles have fibres running down three sides of a tendon eg Quadricep

• Multipennate muscles have fibres branching out from several tendons eg Deltoid

• Multipennate muscles enables the body to produce the most force

Which of the following muscles is fusiform?

• Bicep

• Gastrocnemius

• Deltoid

• Tibialis Anterior

Which of the following is true about the size principle?

• Motor unit recruitment begins with large units to small units

• Motor unit recruitment begins with small units to large units

• Motor unit recruitment depends on the amount of force being produced

• Motor unit recruitment recruits whatever is most excitable

Which of the following is incorrect about small motor units?

• They are slow contracting

• The are easily excitable

• They are fatigue resistant

• They are utilised for high force activities

Which of the following activities is best suited to recruiting large motor units?

• A golf put

• A netball chest press

• A soccer goalkeeper's kick from the box to past half way

• A dart throw

Which of the following is true about the all or nothing principle?

• For the fibres of a motor unit to contract, the electrical impulse must reach a certain threshold, or the fibre will not contract

• The threshold for any muscular contraction is the same

• For the fibres of a motor unit to contract, most of the threshold needs to be met, or no movement will occur

• Motor unit recruitment begins with small units to large units