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Muscle fibers primarily rely on three sources of ATP: phosphocreatine (PCr) breakdown, glycolysis, and oxidative phosphorylation. PCr breakdown provides a quick source of ATP during short bursts of activity, glycolysis produces ATP from glucose in the absence of oxygen, and oxidative phosphorylation in the mitochondria produces the majority of ATP during sustained, aerobic activity.
ATP already in muscles, ATP made by lactic fermentation, and ATP produced by cellular respiration.
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Do skeletal muscle fibers contain sarcomeres whereas smooth muscle fibers do not?
Yes, skeletal muscle fibers contain sarcomeres, which are the repeating units responsible for muscle contractions. In contrast, smooth muscle fibers do not have sarcomeres in the same organized structure but still have contractile proteins.
What contains the highest concentration of thiamin in muscle tissue?
The highest concentration of thiamin in muscle tissue is found in the perimysium, a connective tissue that surrounds bundles of muscle fibers. The perimysium contains a higher concentration of thiamin compared to the muscle fibers themselves.
When a single neuron sends a strong enough impulse to a muscle that how many muscle fibers does it cause to contract?
When a single neuron sends a strong enough impulse to a muscle, it can cause multiple muscle fibers within that muscle to contract. The specific number of muscle fibers that contract will depend on factors like the size of the motor unit and the intensity of the signal from the neuron.
Why are muscle cells commonly called muscle fibers?
Muscle cells are often referred to as muscle fibers because of their long and slender shape, resembling fibers or strands. This elongated shape allows muscle cells to contract and generate force efficiently, which is essential for movement and muscle function.
What gives muscle fibers their striations?
The striations in muscle fibers are caused by the arrangement of contractile proteins within the fibers. These proteins, primarily actin and myosin, overlap and interlock in a regular pattern, giving the muscle fibers a striped appearance when viewed under a microscope.
Does glycerinated skeletal muscle fibers nee ATP in order to contract?
no, they need ATP
Inability of muscle fibers to contract after a long period of contraction?
This is likely due to muscle fatigue, which happens when muscle fibers become depleted of energy sources like ATP needed for contraction. Accumulation of waste products like lactic acid and a decrease in calcium availability can also contribute to muscle fatigue. Rest and replenishing energy sources can help muscles recover and regain the ability to contract.
Does glycerinated skeletal muscle fibers need ATP in order to contract?
true
What energy sources for the contraction of muscle cells?
ATP
What type of muscle is rich in ATP?
Skeletal muscle is rich in ATP as it is the primary energy source for muscle contraction and movement. Skeletal muscle has high energy demands and relies on ATP for fuel during exercise and physical activity.
Glycerinated muscle requires the addition of what molecule to supply the energy for muscle contraction?
Glycerinated muscle requires the addition of ATP (adenosine triphosphate) to supply the energy needed for muscle contraction. ATP is essential for the cross-bridge cycling process that allows muscle fibers to contract.
What are the four possible energy sources for a muscle and the three sources of ATP for muscle contraction?
Creatine phosphate, oxidative phosphorylation, and glycolysis.
Slow-twitch muscle fibers have many mitochondria and produce ATP using?
aerobic respiration
How long can anaerobic respiration sustain maximum muscle activity?
Skeletal muscle fibers can get ATP from 3 sources: -Phosphagen system (a few seconds) -Anaerobic fermentation (less than 2 minutes) -Aerobic respiration (indefinite)
Which groups of words are energy sources for muscles?
Creatine phosphate and ATP are both sources of energy for the muscles. Creatine phosphate is found in vertebrate muscle, while ATP can be found anywhere within the cell.
What are the energy sources for muscle contraction to occur?
Energy is supplied to muscles for contraction by means of adenosine triphosphate being stored in muscle fibers. These are stored from creatine phosphate, enough to power muscle contractions for a few seconds.
What type of muscle fibers are there?
You have three types of muscle fibers. 1) Skeletal muscle fibers. 2) Cardiac muscle fibers. 3) Smooth muscle fibers.
