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21.

Dragging of actin filaments towards 'M' line is termed as:

A.	Power stroke	B.	Refractory stroke
C.	Recovery stroke	D.	None of these

22.

Which of these are released before muscle contraction from sarcoplasmic reticulum:

A.	Calcium ions	B.	Magnesium ions
C.	Potassium ions	D.	None of these

23.

During relaxation the calcium ions are:

A.	Released from sarcoplasmic reticulum into sarcoplasm	B.	Forced back from sarcoplasm to sarcoplasmic reticulum
C.	Further forced from sarcoplasmic reticulum into sarcoplasm	D.	Neither released more nor forced back but remain constant

24.

Which of these processes mark the beginning of muscular contraction:

A.	Release of calcium ions from sarcoplasmic reticulum	B.	Withdrawal of calcium ions into sarcoplasmic reticulum
C.	Both of these processes	D.	None of these processes

25.

The contraction of of a muscle is caused by:

A.	Actin	B.	Myosin
C.	Actomyosin	D.	ATP

26.

Sliding filament theory was proposed by:

A.	Hanson	B.	A.F. Huxley
C.	H.E. Husley	D.	None of these

27.

Functional unit of contractile system in a striped muscle is:

A.	Sarcomere	B.	A-band
C.	Z-band	D.	Myofibril

28.

Muscles are fatigued by accumulation of:

A.	Myosin ATPase	B.	Carbondioxide
C.	Lactic acid	D.	None of these

29.

Chief source of energy for muscle contraction is:

A.	Plasma	B.	Fat
C.	Protein	D.	Glycogen

30.

Contraction and relaxation phase of a muscle is called:

A.	Twitch	B.	Beat
C.	Conduction	D.	Fatigue