Muscular System

Question 1

Skeletal muscles

Answer 1

Muscle composed of cylindrical multinucleate cells with obvious striations; aka voluntary muscle.

Question 2

Smooth muscle

Answer 2

Muscle consisting of spindle-shaped, unstriated muscle cells; involuntary muscle.

Question 3

Cardiac muscle

Answer 3

Specialized muscle of the heart.

Question 4

Tendon

Answer 4

Cord of dense fibrous tissue attaching a muscle to a bone.

Question 5

Endomysium

Answer 5

The thin connective tissue surrounding each muscle wall.

Question 6

Perimysium

Answer 6

The connective tissue enveloping bundles of muscle fibers.

Question 7

Epimysium

Answer 7

The sheath of fibrous tissue surrounding a muscle.

Question 8

Myofibril

Answer 8

Contractile organelles found in the cytoplasm of muscle cells.

Question 9

Sarcomere

Answer 9

The smallest contractile unit of muscle; extends from one disc to the next.

Question 10

Myofilament

Answer 10

Filaments composing the myofibrils; 2 types: actin and myosin.

Question 11

Thick filaments

Answer 11

Made of bundled molecule of the protein myosin; contains enzymes to power contractions.

Question 12

Thin filaments

Answer 12

Composed of the contractile protein actin, plus some regulatory proteins that allow/prevent myosin head-burning actin.

Question 13

Crossbridges

Answer 13

Link the thick and thin filaments together during contraction.

Question 14

Motor unit

Answer 14

One neuron and the skeletal muscles that it stimulates.

Question 15

Muscle fiber

Answer 15

Muscle cells