Motor System

Question 1

What is Cardiac Muscle?

Answer 1

Muscle of the heart
Involuntary
Makes heart beat 
Controlled by nerves of automatic nervous system
Is striated

Question 2

What is smooth muscle?

Answer 2

Involuntary
Found in the lining of many organs
Unstriated

Question 3

What is skeletal muscle?

Answer 3

Voluntary
Makes the bones of the skeleton move
Are attracted to tendons

Question 4

How are triceps and biceps related?

Answer 4

When biceps contract, triceps relax, bones forming elbow joint are brought closer together

When biceps relax, triceps contract, two bones move apart

Question 5

What is a flexor?

Answer 5

Muscle that contracts to bend a joint (bicep)

Question 6

What is an extensor?

Answer 6

Muscle that contracts to straighten a joint (tricep)

Question 7

What is the Central Nervous System (CNS)?

Answer 7

Ensures that biceps and triceps do that attempt to pull against each other

Question 8

What are the two types of myofiaments?

Answer 8

Actin - thin filaments

Myosin - thick filaments

Question 9

What is the process of the Sliding Filament Theory?

Answer 9

Myosin head hydrolyzes ATP to ADP and P

Myosin head binds to actin forming a cross-bridge

Releasing ADP and P, myosin relaxes to its low state, sliding the thin myofilaments

Binding of new ATP releases myosin heads

Question 10

What is type I myosin?

Answer 10

Cause slower muscle twitch
Good for distance runners
Break down ATP slowly but efficient
Rely predominantly on aerobic respiration

Question 11

What is type IIa and type IIx myosin?

Answer 11

Fast twitch muscle fibres
Break down ATP faster but less efficiently
Rely predominantly in anaerobic respiration