Assertion : `Ca^(2+)` plays important role in the musclc contraction.
Reason : `Ca^(2+)` Combines with troponin chain, displacing tropomyosin allowing the myosin head part to combine with actin to from actomyosin complex .

Assertion : - Ca^(++) play an important role in the muscle contraction. Reason :- Calcium bind with a subunit of troponin on actin filaments and thereby remove the masking of active sites for myosin.

During muscle contraction in a sjeletal muscle fibre Ca^(2+) combines with

Go through the following statements During muscle contraction, the width of A-band remains constant while I-band shortens. During muscle contraction, the Ca^(2+) released from the SR bind to the troponin component of thin filament The process of muscle contraction is faster in smooth muscle as they have a well developed sarcoplasmic reticulum. The red muscle fibres have abundant mitochondria, low glycogen and poorly formed sarcoplasmic reticulum.

Go through the following statements During muscle contraction, the width of A-band remains constant while I-band shortens. During muscle contraction, the Ca^(2+) released from the SR bind to the troponin component of thin filament The process of muscle contraction is faster in smooth muscle as they have a well developed sarcoplasmic reticulum. The red muscle fibres have abundant mitochondria, low glycogen and poorly formed sarcoplasmic reticulum.

Go through the following statements During muscle contraction, the width of A-band remains constant while I-band shortens. During muscle contraction, the Ca^(2+) released from the SR bind to the troponin component of thin filament The process of muscle contraction is faster in smooth muscle as they have a well developed sarcoplasmic reticulum. The red muscle fibres have abundant mitochondria, low glycogen and poorly formed sarcoplasmic reticulum.

Go through the following statements During muscle contraction, the width of A-band remains constant while I-band shortens. During muscle contraction, the Ca^(2+) released from the SR bind to the troponin component of thin filament The process of muscle contraction is faster in smooth muscle as they have a well developed sarcoplasmic reticulum. The red muscle fibres have abundant mitochondria, low glycogen and poorly formed sarcoplasmic reticulum.

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.

Ca^(2+) ions play an important role in (i) neuromuscular function (ii) interneuronal transmission (iii) cell membrane integrity (iv) blood coagulation

Assertion: Plants absorb calcium from soil in the form of calcium ions (Ca^(2+)) Reason: Calcium is required by meristematic and differentiating tissues.

Assertion: Plants absorb calcium from soil in the form of calcium ions (Ca^(2+)) Reason: Calcium is required by meristematic and differentiating tissues.