Lesson 1 - Muscles

Question 1

muscles

Answer 1

• groups of fibers with a single functional purpose
• fibers can be wide, flat, cylindrical, long, short, etc
• diameter of a muscle is directly related to its strength
• contract only in a straight line except for sphincter muscles
• all innervated by a single nerve

Question 2

origin

Answer 2

the point of attachment of a muscle that is immobile when a muscle contracts

Question 3

insertion

Answer 3

the point of attachment of a muscle that is mobile when a muscle contracts

Question 4

agonists

Answer 4

• prime movers
• muscles that move a structure
• ex: bicep

Question 5

antagonist

Answer 5

• muscles that oppose an agonist

- ex: tricep

Question 6

synergist

Answer 6

• muscles used to stabilize structures

- ex: brachioradialis