Overview of Muscular System Flashcards
What are the three different types of muscle?
- skeletal muscle
- smooth muscle
- cardiac muscle
What are the two main types of fibers found in skeletal muscle?
- Type I (slow twitch) fibers
- Type II (fast twitch) fibers
[Mnemonic]
“1 slow fat red ox”
(how to remember the characteristics of type 1 fibers in skeletal muscle)
“1 slow fat red ox”
- Type 1
- slow twitch
- fat accumulation
- red fibers
- use oxidative phosphorylation to make ATP
[Mnemonic]
“2 fast skinny white breasts”
(how to remember the characteristics of type 2 fibers in skeletal muscle)
“2 fast skinny white breasts”
- Type 2
- fast twitch
- low lipid
- white fibers (like chicken breasts)
Which kind of muscle tissue has striations?
- skeletal muscle
- cardiac muscle
Which kind of muscle tissue has NO striations?
Smooth muscle
Which kind of muscle tissue causes involuntary body movement?
- smooth muscle
- cardiac muscle
Which kind of muscle tissue is multinucleated?
(many nuclei)
Skeletal muscle
Which kind of muscle tissue is uninucleated?
Smooth muscle
Which kind of muscle tissue causes voluntary body movement?
Skeletal muscle
Which kind of muscle tissue contains intercalated disks?
Cardiac muscle
How are cardiac muscle cells connected to each other?
Via intercalated diskswith manygap junctions.
The gap junctions allow action potentials to spread quickly and efficiently.
Why do slow twitch fibers found in skeletal muscle appear red?
Because they have a high concentration of myoglobin.
What is myoglobin?
A protein that carries oxygen in the muscles.
Smooth and cardiac muscle exhibit myogenic activity. What is myogenic activity?
Contraction WITHOUT nervous system input.
