Muscle Flashcards
What is myalgia?
Muscle pain
What is myasthenia?
Muscle weakness
What is myopathy?
Any disease of the muscle
What is the sarcolemma?
The outer membrane of muscle cells
What is the sarcoplasm?
The cytoplasm of a muscle cell
What are the 3 major muscle types?
NAME?
Is skeletal muscle striated?
Yes
How big are skeletal muscle fibres?
- 1mm-20cm long
- 10-100µm in diameter
What shape are skeletal muscle fibres?
Long parallel cylinders
Describe the nuclei of skeletal muscle cells
Multiple peripheral nuclei
How are skeletal muscles connected?
Fascicle bundles and tendons
What controls skeletal muscle?
Motor neurones
Are skeletal muscles under voluntary or involuntary control?
Voluntary
Describe the action of skeletal muscles?
Rapid and forceful
Is cardiac muscle striated?
Yes
How big are cardiac muscle fibres?
- 50-100µm long
- 10-20µm in diameter
Describe the shape of cardiac muscle?
Short, branched cylinders
Describe the nuclei of cardiac muscle fibres?
Single, central nucleus
How is cardiac muscle contraction controlled?
Intrinsic rhythm, under autonomic modulation
Is cardiac muscle contraction voluntary or involuntary?
Involuntary
Describe the nature of cardiac muscle rhythm?
Lifelong, variable
Is smooth muscle striated?
No
How big are smooth muscle fibres?
- 20-200µm long
- 5-10µm in diameter
What shape are smooth muscle fibres?
Spindle shaped, tapering ends