IB SEHS Topic 1.2

1.2.1 What is the definition of atrophy?

• Reduction in size or wasting away of an organ or tissue

• The ability of a muscle to shorten forcibly when stimulated

• An increase in the size of a tissue or organ

• The ability to stretch a material beyond its resting length

1.2.1 Which three characteristics are found in muscle tissue?

• contractility, extensibility, pivot

• contractility, extensibility, elasticity

• contractility, elasticity, synovial

• contractility, hypertrophy, bursae

1.2.2 Using the picture, identify the row that correctly matches the different types of muscle and the location in the body where they may be found

• A

• B

• C

• D

1.2.2 Which of the following are characteristics of cardiac muscle?

I. Striated

II. Involuntary

III. Voluntary

• I and II only

• I and III only

• II and III only

• I, II and III

1.2.3 What is the name of the outermost layer of connective tissue surrounding skeletal muscle?

• Myofibril

• Epimyosium

• Endomysium

• Perimysium

1.2.3 What is the smallest contractile unit of skeletal muscle?

• Myofibril

• Sarcomere

• Actin

• Myosin

1.2.3 Which part of the skeletal muscle is labelled X in the diagram?

• Myofibril

• Epimysium

• Perimysium

• Endomysium

1.2.3 Which part of the skeletal muscle is labelled X in the diagram?

• Perimysium

• Myofibril

• Sarcomere

• Muscle fibre

1.2.4 What is the definition of the term insertion?

• A tissue that connects two bones together

• A tissue that connects a muscle to bone

• The point of attachment of a muscle tendon to a bone that remains relatively fixed during muscular action

• The point of attachment of a muscle tendon to a bone that usually moves during muscular action

1.2.4 What is the origin of a muscle?

• The main body of the muscle

• The site of a muscle's attachment to the more stationary bone

• The part of the muscle that contracts when the opposite muscle relaxes

• The part of the muscle that attaches to the bone that moves