P. 7 Flashcards
What percentage of a person’s body weight do muscles constitute?
About 40%
How many types of muscles are there?
Three: smooth, cardiac, and skeletal muscles.
Are smooth and cardiac muscles voluntary or involuntary?
Both are involuntary muscles
What controls smooth muscles?
Auto nerves system with one nucleus
What is the shape of smooth muscle cells?
Spindle-shaped.
How are smooth muscle cells arranged?
Smooth muscle cells are arranged in bundles or sheets.
Where are smooth muscles found?
In internal organs.
What type of muscle fibers are cardiac muscles?
Cardiac muscles are involuntary striated muscle fibers.
How are cardiac muscle cells connected to each other?
Cardiac muscle cells are branched and united with each other to form myocardial layers
What is the attachment between cardiac muscle cells?
They are attached by intercalated discs.
What is a unique property of cardiac muscles?
Cardiac muscles have the property of spontaneous and rhythmical contraction.
What are the attachments of skeletal muscles called?
The attachments of skeletal muscles are called origin (fixed end) and insertion (movable end).
What is the fleshy part of a muscle called?
The fleshy part of a muscle is called the belly.
How are muscle fibers in skeletal muscles held together?
Muscle fibers in skeletal muscles are held together by delicate areolar connective tissue, forming the epimysium.
What extends beyond the muscle and forms tendons or aponeurosis in skeletal muscles?
The ends of the epimysium extend beyond the muscle, forming strong, cord-like tendons or sheet-like aponeurosis, mostly composed of tough collagen fibers.
