Muscles (Shape/ Actions)

Question 1

What is the structure and function of a parallel muscle

Answer 1

S: Strap-like
F: Can converge to a narrow attachment

Question 2

What is the structure of a convergent muscle

Answer 2

S: Fascicles radiate out from a small to wide attachment

Question 3

What is the structure of a pennate muscle

Answer 3

S: Feather-like in appearance

Question 4

What is the structure and function of a fusiform muscle

Answer 4

S: Fascicles are close to parallel in the center
F: Converge at a tendon or at one/both ends

Question 5

What is the structure of a spiral muscle

Answer 5

S: Fibers twist towards their point of attachment

Question 6

What is the structure of a circular muscle

Answer 6

S: A circle

Question 7

Define origin

Answer 7

Point of attachment that does not move when muscle contracts

Question 8

Define insertion

Answer 8

Point of attachment that moves when a muscle contracts

Question 9

T/F: Insertions move away from origins when muscles shorten

Answer 9

False: Insertions move towards origins when muscle shortens

Question 10

Define agonist

Answer 10

Muscles that directly perform a specific movement (prime movers)

Question 11

Define antagonist

Answer 11

Muscles that, when contracting, directly oppose prime movers (AKA: they relax while antagonists are contracting to produce movements)

Question 12

Define synergist

Answer 12

Muscles that contract at the same time as the primary movers. They allow movements to be more efficient

Question 13

Define fixator muscles

Answer 13

Joint stabilizers that maintain posture and balance