Muscle Tissue Flashcards
What are the three types of muscle tissue?
- Skeletal muscle. 2. Cardiac muscle. 3. Smooth muscle.
What 4 properties for muscle tissues share?
- Excitability. 2. Contractility. 3. Extensibility. 4. Elasticity.
What is excitability?
The ability to respond to stimulation.
What is contractility?
The ability to shorten actively and exert a pull or tension that is harnessed by connective tissues.
What is extensibility?
The ability to contract over a range or resting lengths.
What is elasticity?
The ability of a muscle to return to its original length after a contraction.
Describe the shape of a skeletal muscle tissue cell (3).
They are: 1. Long and cylindrical. 2. Striated. 3. multinucleate.
Where are skeletal muscles tissues found?
Combined with connective tissues and neural tissues in skeletal muscles.
What are the functions of skeletal muscle tissues? (4)
- Moves or stabilizes the position or the skeleton. 2. Guards entrances and exits to the digestive, respiratory, and urinary tracts. 3. Generates heat. 4. Protects internal organs.
Are skeletal muscle fibers branched or unbranched?
Unbranched.
Describe the shape of cardiac muscle tissue cells (3).
- Short. 2. Branched. 3. Striated.
How are cardiac muscle tissue cells interconnected?
They are interconnected by intercalcated disks.
Where are cardiac muscle tissues found?
The heart.
What are the functions of cardiac muscle tissues? (2)
- Circulates blood. 2. Maintains blood pressure.
Describe the shape of a smooth muscle tissue cell (3).
- Short, spindle-shaped. 2. Non-striated. 3. Single, central nucleus.
Where are smooth muscle tissues found?
Walls of blood vessels and in digestive, respiratory, urinary, and reproductive organs.
What are the functions of smooth muscle tissues? (4)
- Moves food and urine. 2. Reproductive tract secretions. 3. Controls diameter of respiratory passageways. 4. Regulates diameter of blood vessels.
What is another name for a skeletal muscle cell?
A muscle fiber.
Can skeletal muscle fibers divide? If not, how are new ones produced.
No. New muscle fibers are produced through the division of myosatellite cells (satellite cells).
Can skeletal muscles completely repair after an injury?
No, they can only partially repair.
What two contractile filaments are contained within skeletal muscle fibers?
- Actin. 2. Myosin.
What results in the striated appearance of skeletal muscle fibers?
Actin and myosin being arranged in parallel within organized functional groups.
Are skeletal muscle fibers considered a striated voluntary muscle?
Yes.
What is the epimysium? What does it do?
- A layer of dense irregular connective tissue surrounding the entire skeletal muscle. 2. It separates the muscle from surrounding tissues and organs and is connected to the deep fascia.
