Assertion: on stimulation, a muscle cell releases calcium ions `(Ca^(2+))` from sarcoplasmic reticulum.
Reason: By reacting with a protien complex, `Ca^(2+)` uncover active sites on the actin filaments.

[A] : Upon stimulation of a muscle cell, cal- cium ions (Ca^(++)) are released from the sar- coplasmic reticulum. [R]: In reacting with a protein complex, Ca^(++) unmasks myosin binding sites on the ac-tin filaments.

[A] : Upon stimulation of a muscle cell, cal- cium ions (Ca^(++)) are released from the sar- coplasmic reticulum. [R]: In reacting with a protein complex, Ca^(++) unmasks myosin binding sites on the ac-tin filaments.

[A] : Upon stimulation of a muscle cell, cal- cium ions (Ca^(++)) are released from the sar- coplasmic reticulum. [R]: In reacting with a protein complex, Ca^(++) unmasks myosin binding sites on the ac-tin filaments.

[A] : Upon stimulation of a muscle cell, cal- cium ions (Ca^(++)) are released from the sar- coplasmic reticulum. [R]: In reacting with a protein complex, Ca^(++) unmasks myosin binding sites on the ac-tin filaments.

Muscle relaxation involves release/trapping of calcium ion by sarcoplasmic reticulum.

Muscle protein __binds Ca^(2+) that is released from the sarcoptasmic reticulum.

Which muscle protein binds with calcium ions that are released from the sarcoplasmic reticulum?

In sarcoplasmic reticulum, Ca^(2+) binds to a calcium-bindig protein known as

Assertion. On receiving action potential via T-tubules, the sarcoplasmic reticulum releases Ca^(++) into the sarcoplasm. Reason. Ca^(++) uncover the active site of actin myofilament, allowing a meromyosin head to join this site.