Differbetween
The main difference between the sarcolemma and sarcoplasmic reticulum is that sarcolemma is the plasma membrane of a striated muscle fiber. But, the sarcoplasmic reticulum is the smooth endoplasmic reticulum in muscle fibers.
- What is the difference between sarcomere and Sarcolemma?
- What is the sarcoplasmic reticulum?
- What connects the Sarcolemma to the sarcoplasmic reticulum?
- What is the role of sarcoplasmic reticulum in muscle contraction?
- Where are the longest muscle fibers found in the body?
- What is a Sarcolemma?
- What is the structure and function of a sarcoplasmic reticulum?
- What causes calcium to be released from the sarcoplasmic reticulum?
- What does the sarcoplasmic reticulum store and release?
- What connects Myofibrils to the Sarcolemma?
- Is sarcoplasmic reticulum smooth or rough?
- What is a Sarcolemma anatomy?
What is the difference between sarcomere and Sarcolemma?
sarcolemma: The cell membrane of a myocyte. sarcomere: The functional contractile unit of the myofibril of a striated muscle.
What is the sarcoplasmic reticulum?
The sarcoplasmic reticulum (SR) constitutes the main intracellular calcium store in striated muscle and plays an important role in the regulation of excitation-contraction-coupling (ECC) and of intracellular calcium concentrations during contraction and relaxation.
What connects the Sarcolemma to the sarcoplasmic reticulum?
Extension of the muscle cell plasma membrane (sarcolemma) that protrudes deeply into the muscle cell; they function to electrically connect the sarcolemma to the sarcoplasmic reticulum.
What is the role of sarcoplasmic reticulum in muscle contraction?
It is a specialized type of endoplasmic reticulum in muscles cell which primarily functions to store large amounts of Ca+2 ions for muscle contraction. When an action potential occurs, the signal reaches the SR and causes the release of the large stores of Ca+2 ions.
Where are the longest muscle fibers found in the body?
Where are the longest muscle fibers found in the body? The thigh muscle and measure up to 30m 4.
What is a Sarcolemma?
The sarcolemma is a specialized membrane which surrounds striated muscle fiber cells.
What is the structure and function of a sarcoplasmic reticulum?
Sarcoplasmic reticulum (SR) regulates the cytoplasmic calcium ions (Ca2+) concentration of skeletal muscle cells, and thereby controls muscular contraction and relaxation. In connection with these functions, the Ca2+ pump mechanism of the SR has been established as the cause of relaxation.
What causes calcium to be released from the sarcoplasmic reticulum?
During stimulation of the muscle cell, the motor neuron releases the neurotransmitter acetylcholine, which then binds to a post-synaptic nicotinic acetylcholine receptor. ... The inward flow of calcium from the L-type calcium channels activates ryanodine receptors to release calcium ions from the sarcoplasmic reticulum.
What does the sarcoplasmic reticulum store and release?
Muscle: Stimulation
When the muscle is stimulated, calcium ions are released from its store inside the sarcoplasmic reticulum, into the sarcoplasm (muscle ). ... Calcium is pumped back up into the SR to lower calcium ion concentration in the sarcoplasm, to relax the muscle (turn off contraction).
What connects Myofibrils to the Sarcolemma?
b Attachment of Myofilaments to the Sarcolemma
Desmin filaments appear to be anchored to the sarcolemma by a number of adhesion proteins such as vinculin. At myotendinous junctions, the thin myofilaments of the last sarcomere attach to the sarcolemma, which is thrown into numerous villous projections.
Is sarcoplasmic reticulum smooth or rough?
The sarcoplasmic reticulum (SR), from the Greek σάρξ sarx ("flesh"), is smooth ER found in myocytes. The only structural difference between this organelle and the smooth endoplasmic reticulum is the medley of proteins they have, both bound to their membranes and drifting within the confines of their lumens.
What is a Sarcolemma anatomy?
Anatomical terminology
The sarcolemma (sarco (from sarx) from Greek; flesh, and lemma from Greek; sheath) also called the myolemma, is the cell membrane of a striated muscle fiber cell. It consists of a lipid bilayer and a thin outer coat of polysaccharide material (glycocalyx) that contacts the basement membrane.
