Which molecule is found in oxidative muscle fibers and stores oxygen for the cell to use?
Which molecule is found in oxidative muscle fibers and stores oxygen for the cell to use?
Myoglobin, a protein found in the muscle cells of animals. It functions as an oxygen-storage unit, providing oxygen to the working muscles. Diving mammals such as seals and whales are able to remain submerged for long periods because they have greater amounts of myoglobin in their muscles than other animals do.
Where is the myoglobin found?
Myoglobin is found in your heart and skeletal muscles. There it captures oxygen that muscle cells use for energy. When you have a heart attack or severe muscle damage, myoglobin is released into your blood.
Which is the function of myoglobin?
Myoglobin facilitates oxygen diffusion. Myoglobin desaturates at the onset of muscle activity, which increases oxygen’s diffusion gradient from the capillaries to the cytoplasm. Myoglobin has also been shown to have enzymatic functions. It is necessary for the decomposition of bioactive nitric oxide to nitrate.
What protein is responsible for binding and storing oxygen within muscle cells?
myoglobin
Like hemoglobin, myoglobin is a cytoplasmic protein that binds oxygen on a heme group. It harbors only one globulin group, whereas hemoglobin has four.
Does myoglobin carry CO2?
Myoglobin works for muscles cells only, by receiving oxygen from the RBC and further carry it to a mitochondrial organelle of muscles cells….Comparison Chart.
| Basis for comparison | Hemoglobin | Myoglobin |
|---|---|---|
| Type of structure | A tetramer. | A monomer. |
| Binds | Binds CO2, CO, NO, O2 and H+. | Binds to O2, tightly and firmly. |
What do myoglobin levels indicate?
Myoglobin levels are normally very low or not detectable in the urine. High levels of urine myoglobin indicate an increased risk for kidney damage and failure. Additional tests, such as BUN, creatinine, and urinalysis, are done to monitor kidney function in these people.
Which ATP is required for muscle contraction?
creatine phosphate
During contraction, the creatine phosphate breaks into creatine and releases phosphorous which combine with ADP to form ATP. The ATP formed is used up by the muscles for contraction.
Does hemoglobin give oxygen to myoglobin?
Introduction. Myoglobin and hemoglobin are hemeproteins whose physiological importance is principally related to their ability to bind molecular oxygen. The oxygen carried by hemeproteins such as hemoglobin and myoglobin is bound directly to the ferrous iron (Fe2+) atom of the heme prosthetic group.
What makes a muscle fiber oxidative or glycolytic?
The primary metabolic pathway used by a muscle fiber determines whether the fiber is classified as oxidative or glycolytic. If a fiber primarily produces ATP through aerobic pathways, then it is classified as oxidative. More ATP can be produced during each metabolic cycle, making the fiber more resistant to fatigue.
How are slow oxidative fibers used to produce ATP?
Slow oxidative (SO) fibers contract relatively slowly and use aerobic respiration (oxygen and glucose) to produce ATP. Fast oxidative (FO) fibers have relatively fast contractions and primarily use aerobic respiration to generate ATP.
How are oxidative fibers similar to red blood cells?
They also possess myoglobin, an O 2 -binding molecule similar to hemoglobin in the red blood cells. The myoglobin stores some of the needed O 2 within the fibers themselves and is partially responsible for giving oxidative fibers a dark red color.
Why do slow oxidative fibers have more mitochondria?
Slow oxidative fibers have structural elements that maximize their ability to generate ATP through aerobic metabolism. These fibers contain many more mitochondria than the glycolytic fibers, as aerobic metabolism, which uses oxygen (O 2) in the metabolic pathway, occurs in the mitochondria. This allows slow oxidative fibers to contract …
What is the protein component of the thin filament that binds to calcium?
What is the protein component of the thin filament that binds to calcium thereby initiating skeletal muscle contraction? Which of the following is a structural protein that extends along each thick filament from M line to Z line. The shortening of a skeletal muscle fiber during contraction involves which of the following?
Which is structure transmits force from contracting skeletal muscle to bone?
What structure, composed of connective tissue, transmits force from contracting skeletal muscle to bone? Nice work! You just studied 138 terms! Now up your study game with Learn mode.
How is the actin myosin complex broken during muscle contraction?
In order for crossbridge cycling to occur, the actin-myosin complex must be broken by which of the following? The sequence of events that links the action potential to changes in skeletal muscle force development is called what? During skeletal muscle contraction, multiple crossbridge cycles are occurring between the same thick and thin filament.
How are muscle fibers innervate by motor neurons?
E) Each muscle fiber is innervated by multiple motor neurons. Increases in the amount of cytoplasmic calcium required to initiate a muscle contraction are mediated by the coupling between a ________ on the T tubule and a ________ on the membrane of the sarcoplasmic reticulum.