Muscle Module 1

Question 1

What are the two basic functions of muscle

Answer 1

• to store energy in the form of complex sugars

- to convert chemical energy to mechanical energy

Question 2

what are some of the specific functions of muscles

Answer 2

• locamotion
• posture
• cardiac pump
• walls of digestive organs
• visual accomadation
• sweating
• vasoconstriction

Question 3

What is the 3 part breakdown of muscle

Answer 3

sarcomere-> Myofribral-> muscle fiber

Question 4

What are the three surrounding layers of a muscle fiber

Answer 4

• epimysium
• perimysium
• endomysium

Question 5

what is the big center of a muscle fiber called

Answer 5

belly

Question 6

what is the belly of the muscle surrounded by

Answer 6

tendon

Question 7

what are the dimensions of muscle fibers

Answer 7

• 50 μm

- 1 cm

Question 8

what are the functional units of a muscle fiber

Answer 8

myofibril

Question 9

what is the functional unit of a myofibril

Answer 9

sarcomere and z disk

Question 10

what is the length of a sarcomere

Answer 10

2.1 μm

Question 11

What are sarcomeres made of

Answer 11

thin and thick filaments

• thick: 1.6 μm
• thin 1.0 um

Question 12

what were the 2 theories of contraction

Answer 12

• filament shortening

- filaments will slide over one another

Question 13

what is the correct theory of contraction

Answer 13

filaments slide over one another no change ion length. Involves 1 thick filament and two thin filaments

Question 14

what is the breakdown for a thin filament:

Answer 14

• G actin (350 per filament)
• Tropomysin (50 filaments)
• Troponin complex (50 per filament)

Question 15

what is the breakdown of a thick filament

Answer 15

• myosin heavy chain

- myosin light chain