MUSCULAR SYSTEM - Skeletal Muscle Histology Flashcards
1
Q
What are skeletal muscles?
A
Voluntary, striated muscles that shorten and pull on bones.
2
Q
What is the neuromuscular junction?
A
The point of contact between a nerve and a muscle.
3
Q
What is a myofiber?
A
A muscle “cell” with multiple peripheral nuclei.
4
Q
What are myofilaments?
A
Contractile proteins actin and myosin.
5
Q
What is a sarcomere?
A
The functional unit of muscle contraction from one Z-disc to another.
6
Q
What is the sarcolemma?
A
The cell membrane of myofibers.
7
Q
What are T-tubules?
A
Extensions of the sarcolemma that penetrate muscle fibers.
8
Q
What is the sarcoplasmic reticulum?
A
The smooth endoplasmic reticulum of muscle cells that stores calcium.
9
Q
What is a muscle triad?
A
One T-tubule and two terminal cisterns.
