Bio - Muscles and Anatomy of Movement

Question 1

Types of muscle fibre orientations

Answer 1

Parallel (in line with applied force)
Pennate (not in line with force)

Question 2

Characteristics of parallel muscle fibre orientations

Answer 2

Large ROM
Low number of muscle fibres per cross-sectional area
Low force production
Fast contractions

Question 3

Characteristics of pennate muscle fibre orientations

Answer 3

Smaller ROM
High number of muscle fibres per cross-sectional area
High force production
Normally work with tendons

Question 4

What connects motor neurons to muscle fibres

Answer 4

Motor endplates

Question 5

A single action potential is

Answer 5

A muscle twitch

Question 6

Several action potential across a short space of time is

Answer 6

A tetanus contraction

Question 7

Role of an antagonist muscle

Answer 7

Opposing muscle to agonist muscle
Relaxes when agonist muscle contracts
Contracts when agonist muscle relaxes

Question 8

Role of a stabiliser muscle

Answer 8

Steadies primary mover

Question 9

Role of an agonist muscle

Answer 9

The muscle that causes movement

Question 10

Role of a neutraliser

Answer 10

Resists unwanted movement

Question 11

Factors that affect muscle force

Answer 11

Cross-sectional area
Force-length relationship
Force-velocity relationship

Question 12

Cross-sectional area of muscle

Answer 12

Number of muscle fibres per unit area

Question 13

Force-length relationship

Answer 13

At different lengths, muscles produce different magnitudes of force

Question 14

Force-velocity relationship

Answer 14

At different velocities changes how much force a muscle can produce