Fundamentals of Human Physiology

If you were to dissect a muscle, you would first cut through the outer connective tissue called the: _______.

• epimysium

• perimysium

• endomysium

• fascia

Once you cut through the epimysium you would see small bundles of fibres wrapped in a connective tissue sheath. These bundles are called: _______.

• fascicles

• myofibrils

• sarcomeres

• tendons

The connective tissue surrounding each fasciculus is called the: _______.

• perimysium

• epimysium

• endomysium

• sarcolemma

Each muscle fibre is covered by a connective tissue called: _______.

• endomysium

• perimysium

• epimysium

• fascia

The perimysium is a connective tissue that wraps around _______.

• bundles of muscle fibers

• individual muscle fibers

• entire muscles

• muscle tendons

Each muscle fiber contains several hundred to thousand: _______.

• myofibrils

• fascicle

• mitochondria

• ribosomes

A sarcomere is the basic functional unit of a myofibril. Each myofibril is composed of numerous sarcomeres joined end to end at the _______.

• Z discs

• M line

• A band

• I band

Two types of protein filaments that are responsible for muscle action: _______ (thick) & _______ (thin).

• Myosin, Actin

• Keratin, Elastin

• Collagen, Elastin

• endomysium, perimysium

Each myosin is composed of two protein strands twisted together into a globular head called the _______.

• myosin head

• actin filament

• tropomyosin

• sarcomere

Actin is composed of three different protein molecules, actin and: _______ & _______.

• Tropomyosin, Troponin

• Myosin, Keratin

• Collagen, Elastin

• Fibrin, Albumin