Muscles

Question 1

What are the three types of muscles?

Answer 1

Skeletal
Cardiac
Smooth

Question 2

What is skeletal muscle?

Answer 2

Voluntary muscle
Usually attached to bones via tendons
Striated

Question 3

What is the cardiac muscle?

Answer 3

Involuntary muscle
Occurs in the heart
Striated

Question 4

What is the smooth muscle?

Answer 4

Involuntary muscle
Occurs in the walls of the digestive tract, uterus and blood vessels
Un - striated

Question 5

What characteristics of muscle tissue?

Answer 5

Excitability or responsiveness
Contractility
Extensibility
Elasticity

Question 6

What are the roles of the muscle?

Answer 6

Movement
Posture and position
Generate heat
Stabilise joints

Question 7

What is the structure of skeletal muscle?

Answer 7

Epimysium
Permysium and fasciles
Endomysium

Question 8

What are some of the features to do with skeletal muscle fibres?

Answer 8

Can range in size
Each muscle fibre is made of bundles of myofibrils
Each muscle fibres contains many nuclei

Question 9

What are the anatomy of skeletal muscle fibres?

Answer 9

Sarcoplasmic reticulum 
T - tubule 
Sarcoplasm 
Triad 
Terminal cisterna

Question 10

Features of myofibrils

Answer 10

They are bundled up into muscle fibres and surrounded by sarcolemma
Rod - like contractile elements
Composed of sarcomeres arranged end to end

Question 11

Features of the sarcomere

Answer 11

Myosin 
Actin 
I-band 
A band 
H zone 
M line 
Z disc

Question 12

What is Tropomyosin?

Answer 12

Rod shaped
Stabilises actin
In relaxed muscle they block myosin binding sites on actin

Question 13

What is Troponin?

Answer 13

Globular shaped

Binds calcium released by the occurrence of an action potential