Muscle Tissue Flashcards
What is muscle tissue?
Muscle tissue is composed of bundles of elongated muscle cells or muscle fibers
Muscle fibers can ____ or _____ which determines whether the muscles to do the same.
Contract
Relax
There are two groups of types of muscles, what are they?
Voluntary and Involuntary muscles.
What is an voluntary muscle?
It is connected to the skeleton throughout the body. Controlled by conscious decision.
What is a involuntary muscle?
Voluntary muscle is found in organ walls throughout the body. Not controlled by conscious decision.
What is the structure of skeletal muscle?(5)
- Bundles of long muscle cells called muscle fibers
- Muscle fibers are enclosed by a membrane: sarcolemma
- Muscle fibers lie parallel to each other
- Inside muscle fibers are myofibrils
- myosin and actin
What is the function of skeletal muscle?
Responsible for voluntary movements eg. Walking
Where is skeletal muscle located?
Attached to our bones by tendons.
What is structure of cardiac muscles?(4)
- muscle fibers are rectangular and branched
- one or two centrally positioned nuclei
- striated
- have intercalated discs
What is the function of cardiac muscle?
Cause the beating of the heart
Where is cardiac muscle found?
Found in the muscle
What is the structure of smooth muscle?(4)
- Elongated and Spindle shaped cells
- Single, Large, oval centrally located nucleus
- Not striated
- Contain myosin and actin
What is the function of smooth muscle?
- controls slow, involuntary movements in organs
- involved in peristalsis
Where is smooth tissue located?(6)
- walls of digestive tract
- glands of digestive tract
- bladder wall
- walls of blood vessels
- skin
- reproductive organs
What is actin?
Protein that is an important contributor to the contractile property of muscle and other cells.
