Endoplasmic reticulum or sarcoplasmic reticul | vedclass

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Question

(D) The sarcoplasmic reticulum $(SR)$ is a specialized type of endoplasmic reticulum found in muscle cells. It acts as a storage site for calcium ions

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(D) The sarcoplasmic reticulum $(SR)$ is a specialized type of endoplasmic reticulum found in muscle cells. It acts as a storage site for calcium ions $(Ca^{2+})$. During muscle excitement,calcium ions are released from the $SR$ into the sarcoplasm,which triggers muscle contraction. During muscle relaxation,these calcium ions are actively pumped back into the $SR$. Since the $SR$ is involved in all these processes,the correct answer is $D$.

Description	Structures
$a$. Tibia and fibula	Both form parts of knee joint
$b$. Cartilage and cornea	No blood supply but do require oxygen for respiratory need
$c$. Shoulder joint and elbow joint	Ball and socket type of joint
$d$. Premolars and molars	$20$ in all and $3$ rooted

Endoplasmic reticulum or sarcoplasmic reticulum plays a major role during

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