Muscle Histology

Question 1

Types of Muscles

Answer 1

Striated (skeletal and cardiac) and Smooth (no striations, involuntary)

Question 2

What is skeletal muscle

Answer 2

Striated muscle attached to bone, move the skeleton

• Fibers = multinucleated cells
• Voluntary contractions

Question 3

What is cardiac muscle

Answer 3

Striated muscle in wall of heart, involuntary contractions

Question 4

Skeletal Muscle

Answer 4

• Consists of long multinucleated muscle fibres
• Contains myofibrils, containing thick actin and thin myosin filaments

Question 5

Sarcomeres

Answer 5

Question 6

Sarcoplasmic reticulum

Answer 6

Depolarisation of T tubule membrane triggers Ca2+ to release, Ca2+ binds to troponin-tropomyosin complex to initiate muscle contraction

Muscle relaxes when Ca2+ concentration in cytosol decreases

Question 7

What does the neuromuscular junction have to do with this

Answer 7

• Where axon ends and joins to muscle fibre
• Contains neurotransmitter ACh

Question 8

Contraction visualisation

Answer 8

Question 9

Cardiac Muscle

Answer 9

Contain intercalated disks

Question 10

Cardiac Muscle Contraction

Answer 10

Question 11

Smooth Muscle

Answer 11

Question 12

Smooth Muscle Contraction

Answer 12

Question 13

Comparison table 1

Answer 13

Question 14

Comparison table 2

Answer 14

Question 15

Muscle injury and repair comparisons

Answer 15

Question 16

Microscopic comparisons

Answer 16