Chapter 9: Muscular System Flashcards
(6 cards)
1
Q
What are the three types of muscle tissue?
A
Skeletal, cardiac, smooth
2
Q
What are the parts of skeletal muscle from largest to smallest?
A
Muscle > fascicle > muscle fiber > myofibril > sarcomere
3
Q
What happens at the neuromuscular junction?
A
Nerve releases acetylcholine, triggers muscle fiber to contract
4
Q
What is the sliding filament theory?
A
Actin and myosin slide past each other to shorten the muscle
5
Q
What causes a muscle action potential?
A
Sodium enters, potassium exits, creating electrical signal
6
Q
What are the steps of muscle contraction?
A
- Signal arrives, 2. Calcium is released, 3. Myosin binds to actin, 4. Muscle contracts
