Muscluar System Flashcards
Describe Skeletal Muscle?
The skeletal muscle is a voluntary striate muscle that is usually attached at either end to bones.
What is the name are the points where muscle joins the bones called?
The point where muscle joins the bone at the stationary end is called its origin. Where the muscle joins the bone at the other end is called the insertion.
What usually connects muscle with bone?
Tendons.
What is skeletal muscle composed of?
It is composed of muscular tissue, connective tissue, nervous tissue and blood vessels.
What is muscular tissue used for?
- movement.
- stability of the body.
- control of body passages and openings.
- heat production.
What activities are muscle cells able to carry out?
- excitability.
- conductivity.
- contractility.
- extensibility.
- elasticity.
What are the main similarities and differences between skeletal muscle and cardiac muscle.
Whilst both are striated muscle, skeletal muscle is under voluntary control whilst the cardiac muscle is involuntary.
Describe a muscle fibre?
A muscle fibre is a long slender cell with multiple nuclei.
What is the sarcolemma?
The sarcolemma is a thin membrane covering a striated muscle fibre.
What is the sarcophagi?
It is the cytoplasm of a muscle cell.
What does the cytoplasm of a muscle cell contain?
It contains large amounts of glycosomes as well as myoglobin. It is mainly occupied by myofibrils.
What important protein does myofibrils contain?
The myofibrils contain actin which is component that makes up most of thin protein.
Define Contractility?
Skeletal muscle contracts only when stimulated by somatic motor neuron.
Where do muscle fibres and nerves meet?
They meet at a complex of synapses called neuromuscular junction.
What is located at the end of each nerve tip?
At the end of a nerve fibre is a synaptic knob.
