Muscles Flashcards
1
Q
What are contractions caused by?
A
The sliding of actin and myosin filaments pas each other within cells
2
Q
Smooth/involuntary muscle
A
- Walls of blood vessels
- Digestive tract
- Nonstriated
- Connected to each other through junctions that allow electrical impulses to pass
- Under control of the autonomic nervous system
3
Q
How does smooth muscle contract?
A
In response to action potentials and mediated by actin-myosin fibers
4
Q
Skeletal/Voluntary Muscles
A
- Striations
- sarcomeres
- somatic nervous system
5
Q
Striations
A
Alternating light and dark bands caused by overlapping strands of myosin protein filaments that slide past thin actin protein filaments during contraction
6
Q
sacromeres
A
section of actin and miyosin filaments that form contractile unites within each muscle cell
7
Q
What stimulates skeletal muscle fiber?
A
- Nerves though neuromuscular synapses
- An action potential moves over the whole muscle fiber,releasing calcium, which causes the actin and myosin to slide over eachother
