Muscular System

Question 1

Origin

Answer 1

The attachment to the immovable bone

Question 2

Insertion

Answer 2

The attachment to the movable bone

Question 3

Fixator

Answer 3

Muscles stabilize the origin of a prime mover

Question 4

Synergist

Answer 4

Either produce the same movement or reduce undesirable movements

Question 5

Agonist

Answer 5

Prime mover, the muscle that produces a particular movement

Question 6

Antagonist

Answer 6

Produces the opposite effect on the same bones

Question 7

Muscle fiber

Answer 7

Muscle cell

Question 8

Myofybril

Answer 8

Long ribbonlike fibers of a muscle cell, contain sarcomeres

Question 9

Myofilament

Answer 9

Threadlike proteins in the myofibril, two types: actin, myosin

Question 10

Actin

Answer 10

Thin myofilament

Question 11

Myosin

Answer 11

Thick myosin

Question 12

Sarcomere

Answer 12

Functional unit of the muscle fibers, made of actin and myosin

Question 13

Sarcolemma

Answer 13

Muscle cell membrane

Question 14

Sarcoplasmic reticulum

Answer 14

Stores calcium ions needed for contraction

Question 15

A band

Answer 15

Runs the entire length of a single thick filament, darker

Question 16

I band

Answer 16

Where thin filaments are not overlapped by thick filaments, lighter

Question 17

H zone

Answer 17

Lighter region with the A band where there are no thin filaments

Question 18

M line

Answer 18

Middle of the sarcomere, contains tiny proteins rods that hold adjacent thick filaments together

Question 19

Z disc

Answer 19

End if the sarcomere where actin filaments meet, middle of the I band

Question 20

Neuromuscular junction

Answer 20

Axon terminal forms a junction with the sarcolemma

Question 21

ACh

Answer 21

Neurotransmitter responsible for muscle contraction

Question 22

Endomysium

Answer 22

Connective tissue wrapping around a muscle fiber

Question 23

Perimysium

Answer 23

Connective tissue wrapping around a fascicle

Question 24

Epimysium

Answer 24

Connective tissue wrapping around a muscle

Question 25

Fascicle

Answer 25

Group of muscle fibers bundled together

Question 26

Muscle (organ)

Answer 26

Group of fascicles bundled together

Question 27

Synapse

Answer 27

Space where the neuron and muscle cell meet