Vocabulary Quiz 6

Question 1

Thin filaments are anchored to Z discs. Their main component is the protein ____. Individual ____ molecules join to form an _____ filament that is twisted into a helix

Answer 1

Actin

Question 2

An energy-rich molecule found in muscle fibers

Answer 2

Creatine Phosphate

Question 3

A chronic, painful, nonarticular rheumatic disorder that affects the fibrous connective tissue components of muscles, tendons, and ligaments.

Answer 3

Fibromyalgia

Question 4

Same length contraction; not moving anything.

Answer 4

Isometric Contraction

Question 5

Some tension contraction; length changes, moving something.

Answer 5

Isotonic Contraction

Question 6

A chemical produced by the body in your muscles during exercise.

Answer 6

Lactic Acid

Question 7

Region of the sarcolemma of a muscle fiber (cell) that includes acetylcholine(ACh) receptors, which bind ACh released by synaptic end bulbs of somatic motor neurons

Answer 7

Motor End Plate

Question 8

A motor neuron together with the muscle fibers it stimulates.

Consists of a somatic motor neuron plus all of the skeletal muscle fibers it stimulates.

Answer 8

Motor Unit

Question 9

Bundle of muscle fibers wrapped in perimysium.

Answer 9

Muscle Fascicle

Question 10

A sustained, partial contraction of portions of a skeletal or smooth muscle in response to activation of stretch receptors or a basline level of action potentials in the innervating motor neurons.

Muscle definition; muscles are more contracted at rest for athlete than non athlete.

Answer 10

Muscle Tone

Question 11

Inherited muscle destroying diseases, characterized by degeneration of muscle fibers, which causes progressive atrophy of the skeletal muscle.

Answer 11

Muscular Dystrophy

Question 12

Weakness and fatigue of skeletal muscles cause by antibodies directed against acetylcholine receptors.

An autoimmune disease that causes chronic, progressive damage of the neuromuscular junction.

Answer 12

Myasthenia Gravis

Question 13

Threadlike structuresextending longitudinally through a muscle fiber consisting mainly of thick filaments and thin filaments

Answer 13

Myofibril

Question 14

The oxygen-binding, iron-containing protein present in the sarcoplasm of muscle fibers; contributes the red color to muscle

Answer 14

Myoglobin

Question 15

The contractile protein that makes up the thick filaments of muscle fibers

Answer 15

Myosin

Question 16

A synapse between the axon terminals of a motor neuron and the sarcolemma of a muscle fiber

Answer 16

Neuromuscular Junction

Question 17

After death, the resulting condition in which muscles are in a state of rigidity (cannot contract or stretch).

Answer 17

Rigor Mortis

Question 18

A contractile unit in a striated muscle fiber extending from one Z disc to the next Z disc

Filaments inside a myofibril are arranged in compartments called ______. They are the basic functional units of the myofibril.

Answer 18

Sarcomere

Question 19

A fluid-filled system of membranous sacs called ____ encloses each myofibril.

A network of saccules and tubes surrounding myofibrils of a muscle fiber, comparable to endoplasmic reticulum; functions to reabsorb calcium ions during relaxation and to release them to cause contraction

Answer 19

Sarcoplasmic Reticulum

Question 20

Muscles not allowed to relax.

Answer 20

Tetanus

Question 21

As muscular tissue contracts, it produces heat.

Answer 21

Thermogenesis

Question 22

Narrow, plate-shaped regions of dense protein material called ____ separate one sarcomere from the next.

Answer 22

Z Disc