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What is treppe and why does it occur?
"Treppen" is a German word for "staircase" in English. In the context of muscle physiology, treppe refers to the phenomenon where a muscle fiber exhibits a gradual increase in tension and contraction strength when stimulated at increasing frequencies. This occurs due to the progressive build-up of calcium ions in the muscle fiber, leading to an increase in cross-bridge formation between actin and myosin filaments.
What is the description of a chromatin fiber?
A chromatin fiber is the point at which DNA in chromatin is higher then the nucleosome. Chromatin fibers occur when the linear array of the nucleosome fold into a tighter fiber.
How does muscle contraction occurs?
Muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. While under tension, the muscle may lengthen, shorten, or remain the same. Although the term contraction implies shortening, when referring to the muscular system, it means muscle fibers generating tension with the help of motor neurons (the terms twitch tension, twitch force, and fiber contraction are also used).
Do hyperplasia of muscle cells occur in all muscle types?
Hyperplasia affects the all types of muscle cells.
What does uncontrolled cell division occur in?
cancer
Does dairy cause joint pain?
No. Smoking causes lung cancer , Skin Disease, and teeth to rot, but there is no sign of it being able to cause joint pain.
The smallest functional unit of the muscle fiber?
The smallest functional unit of a muscle fiber is the sarcomere. Sarcomeres are composed of actin and myosin filaments arranged in a repeating pattern, allowing for muscle contraction and relaxation to occur. They are responsible for the striated appearance of skeletal muscle under a microscope.
Tearing of muscle fiber is known as?
Muscle fiber tears are known as muscle strains or muscle tears. They occur when the muscle is stretched too far or overloaded, causing damage to the muscle fibers. Symptoms may include pain, swelling, and limited range of motion.
What is treppe and why does it occur?
"Treppen" is a German word for "staircase" in English. In the context of muscle physiology, treppe refers to the phenomenon where a muscle fiber exhibits a gradual increase in tension and contraction strength when stimulated at increasing frequencies. This occurs due to the progressive build-up of calcium ions in the muscle fiber, leading to an increase in cross-bridge formation between actin and myosin filaments.
Must skin cancer moderate dysplastic nevus be removed?
Dysplastic nevi are not actually considered cancer. Sometimes melanomas can occur within one, but rarely. The presence of dysplastic nevi are indicative of an increased risk for cancer in the future. The more in number you have, the more likely melanoma will occur, usually as a new "mole." Most doctors remove moderate to severe displastic nevi.
How do the nerve impulses get from the sarcolemma plasmalemma into the individual muscle fiber?
Nerve impulses travel down from the neuron and cause ACh to be released at the axon terminal. If enough Ach binds to the receptors on the plasmalemma the action potential is tranmitted through the whole muscle fiber because Na+ enters the cell and depolarize it. The action potential travels along the T-tubules. These transmit it to the Sarcoplasmatic Reticulum which releases Ca2+ into the muscle fiber (as do the T-tubules themselves). The Ca2+ frees the bindingsite for myosin on actin so that contraction can occur.
What time can you have cancer?
Cancer can occur at almost any age.
What can occur from secondhand smoke?
Lung cancer or just cancer.
Which parts of the body can you have cancer?
Cancer can occur anywhere in/on the body.
Do floods occur in Central America?
Very rarely
What happens when acetylcholine does not bind to muscle?
When acetylcholine does not bind to muscle cells, it prevents the activation of nicotinic acetylcholine receptors at the neuromuscular junction. This failure to activate the receptors inhibits the influx of sodium ions, which is necessary for generating an action potential in the muscle fiber. Consequently, muscle contraction cannot occur, leading to muscle weakness or paralysis. This can happen in various conditions, such as myasthenia gravis or in the presence of certain toxins.
What are the differences between isometric, concentric, and eccentric muscle contractions?
Isometric muscle contractions happen when the muscle stays the same length, concentric contractions occur when the muscle shortens, and eccentric contractions occur when the muscle lengthens.
