A&P I Muscles
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Three Types of Muscle Tissue:
Comprised of very long muscle cells, this muscle tissue is found in the muscles that move the skeleton and able to be controlled voluntarily (voluntary muscle). In addition, this tissue type displays alternating light and dark bands giving the appearance of stripes and striations
Muscle tissue found only in the heart. Similar to skeletal tissue, also has striations. However, unlike skeletal tissue, for the most part cardiac tissue can not be controlled and is thusly considered involuntary. There is some neuronal regulation that controls the beating of the heart but that occurs at a subconscious level.
This type of muscle tissue is found in the walls of hollow visceral organs such as the stomach and the bladder. This tissue type lacks striations and can not be consciously regulated or controlled (involuntary muscle)
The ability to recieve or respond to stimuli
The ability to shorten forcibly when adequately stimulated
The ability to be stretched or extended
The ability of a muscle fiber to recoil and resume its normal resting length after being stretched or contracted
Define: Producing movement
The movement of the skeleton
Define: Maintaining Posture
The ability to make minute changes in positioning to maintain normal position
Define: Stabilizing Joints
Muscle tissue and muscle connections surround joints and keep them in position
Define: Generating Heat
Muscles generate heat as they contract thereby maintaining normal body temp
Brake Down of Skeletal Muscle
Muscle --> Fascile --> Muscle fiber --> Muscle Cell
- Muscle: A bundle of muscle fascicles
- Fascicle: A bundle of muscle fibers
- Muscle fiber: Is a muscle cell
- Muscle Cell: Contains Myosin and Actin
"within the muscle"- A sheath of primarily reticular fibers that covers the muscle fascicle
"around the muscle"- A sheath of fibrous connective tissue that covers the muscle fascicle
"outside the muscle"- A shaeth of dense irregular connective tissue that covers the whole muscle
- The place of attachment which provides little to no movement (bone moves to origin)
The place of attachment which provides the most movement (movable bone)
Direct or Fleshy attachments
The epimysium fuses to the periosteum of a bone or perchondrium of a cartilage
The connective tissue wrappings of the muscle extend beyond the muscle to form either a rope like tendon or a sheet like aponeurosis
Cell membrane of the muscle cell
Cytoplasm of the muscle cell
Red pigment that stores oxygen in the muscle
Rod-like fibers that run parallel down the length of the muscle fiber. Hundreds to thousands of myofibrils can be found in one fiber and account approximately for 80% of the cellular volume.
Globular heads on Myosin .
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