Muscle

Question 1

Muscle Belly

Answer 1

is the entire muscle as a whole (e.g. biceps)

Question 2

Fascicle

Answer 2

is a bundle of muscle fibers; it takes many fascicles combined, to make up the muscle belly

Question 3

Muscle Fiber (Muscle Cell)

Answer 3

is a long fiber about the size of one strand of hair; it contracts to produce force

Question 4

Myofibril

Answer 4

is a long fibril and smaller than a muscle fiber; there are hundreds of myofibrils inside one single muscle fiber

Question 5

Sarcomere

Answer 5

is the smallest contractile unit of a myofibril; each sarcomere is linked together like a chain to make one myofibril

Question 6

Myofilaments

Answer 6

are short protein filaments found within a sarcomere; there are two myofilaments called Actin and Myosin

Question 7

Actin and Myosin

Answer 7

are the two myofilaments inside a sarcomere responsible for muscle contraction