Introduction to muscles video quiz

Question 1

What is a bundle of myofibers?

Answer 1

fascicle

Question 2

Which connective tissue surrounds the fascicles?

Answer 2

perimysium

Question 3

What is the wrapping of connective tissue on the surface of a muscle organ?

Answer 3

epimysium

Question 4

What is the layer of areolar connective tissue surrounding the muscle fibers within a fascicle?

Answer 4

endomysium

Question 5

What is the specialized form of endoplasmic reticulum surrounding myofibrils within a muscle fiber?

Answer 5

sarcoplasmic reticulum

Question 6

What is the repeating unit within a myofibril that consist of overlapping thick and thin myofilaments?

Answer 6

sarcomere

Question 7

What is the motor protein found in thick filaments of the sarcomere?

Answer 7

myosin

Question 8

What is the calcium sensor protein found in thin filaments of the sarcomere?

Answer 8

troponin

Question 9

What protein found in thin filaments covers the myosin binding sites of actin to prevent cross-bridge formation?

Answer 9

tropomyosin

Question 10

What molecule provides the chemical energy that is used by myosin proteins within muscle fibers?

Answer 10

ATP

Question 11

What is the plasma membrane of a muscle fiber?

Answer 11

sarcolemma

Question 12

What are the channels filled with extracellular fluid that enable an action potential to rapidly spread deep into a muscle fiber?

Answer 12

t- tubules

Question 13

What are the ends of a sarcomere that move closer to each other during contraction?

Answer 13

Z- lines

Question 14

What region of the sarcomere contains the entire legnth of the thick filaments and the overlapping portions of thin filaments?

Answer 14

A- band

Question 15

When a skeletal muscle is contracting to produce an action, what is a the point of muscle attachment that remains stationary?

Answer 15

origin

Question 16

During an action performed by a skeletal muscle, what is the muscle attachment that moves?

Answer 16

insertion

Question 17

What is a muscle that produces the majority of the force required for a specific movement?

Answer 17

prime mover

Question 18

What is a muscle that becomes longer during a movement and produces force to help slow down that movement?

Answer 18

antagonist

Question 19

What muscle is a prime mover for abduction of the shoulder joint?

Answer 19

deltoid

Question 20

What is a single motor neuron and all the muscle fibers that it excites?

Answer 20

motor unit