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Muscle Contraction Quiz

Total questions: 20

Worksheet time: 10mins

Name
Class
Date
1.

Sarcomere is defined as the distance between

a)

Two M lines

b)

Two H zones

c)

Two Z lines

d)

Two A bands

e)

Two Z lines

2.

Which band shortens during muscle contraction?

a)

A band

b)

I band

c)

H zone

d)

M line

e)

I band

3.

Which band remains constant during muscle contraction?

a)

I band

b)

A band

c)

H zone

d)

Z line

e)

A band

4.

H zone contains which filaments?

a)

Only actin

b)

Only myosin

c)

Both actin and myosin

d)

Titin

e)

Only myosin

5.

Z line anchors which filament?

a)

Myosin

b)

Actin

c)

Troponin

d)

Tropomyosin

e)

Actin

6.

Which protein forms thick filaments?

a)

Actin

b)

Myosin

c)

Troponin

d)

Titin

e)

Myosin

7.

Which protein covers active sites on actin at rest?

a)

Troponin I

b)

Troponin C

c)

Tropomyosin

d)

Myosin head

e)

Tropomyosin

8.

Calcium binds to which subunit of troponin?

a)

Troponin T

b)

Troponin I

c)

Troponin C

d)

Tropomyosin

e)

Troponin C

9.

Source of calcium for skeletal muscle contraction is?

a)

Extracellular fluid

b)

Sarcoplasmic reticulum

c)

Mitochondria

d)

T tubules

e)

Sarcoplasmic reticulum

10.

T tubules are invaginations of?

a)

Nuclear membrane

b)

Sarcoplasmic reticulum

c)

Plasma membrane

d)

Mitochondria

e)

Plasma membrane

11.

Neurotransmitter released at NMJ is?

a)

Dopamine

b)

Noradrenaline

c)

Acetylcholine

d)

GABA

e)

Acetylcholine

12.

Receptor present on motor end plate is?

a)

Muscarinic receptor

b)

Nicotinic receptor

c)

Alpha receptor

d)

Beta receptor

e)

Nicotinic receptor

13.

Energy for muscle contraction is provided by?

a)

ADP

b)

ATP

c)

AMP

d)

Creatine

e)

ATP

14.

Power stroke occurs due to?

a)

Attachment of ATP

b)

Release of ADP and Pi

c)

Binding of calcium

d)

Hydrolysis of creatine phosphate

e)

Release of ADP and Pi

15.

Rigor mortis occurs due to lack of?

a)

Calcium

b)

ATP

c)

Actin

d)

Myosin

e)

ATP

16.

During relaxation calcium is pumped back into SR by?

a)

Passive diffusion

b)

Ca ATPase pump

c)

Na K pump

d)

Myosin ATPase

e)

Ca ATPase pump

17.

Which enzyme splits ATP during contraction?

a)

Actin ATPase

b)

Myosin ATPase

c)

Creatine kinase

d)

Calmodulin

e)

Myosin ATPase

18.

Length of sarcomere at optimal contraction is about?

a)

1 µm

b)

2–2.2 µm

c)

3 µm

d)

4 µm

e)

2–2.2 µm

19.

Triad in skeletal muscle consists of?

a)

One T tubule and one SR

b)

Two T tubules and one SR

c)

One T tubule and two SR

d)

Three T tubules

e)

One T tubule and two SR

20.

Sliding filament theory was proposed by?

a)

Hodgkin and Huxley

b)

Huxley and Hanson

c)

Sherrington

d)

Bernard

e)

Huxley and Hanson

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