Cardiac muscle is highly resistant to fa...

Cardiac muscle is highly resistant to fatigue. Justify.

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The cardiac muscle is highly resistant to fatigue, because it has numerous sarcosomes, many molecules of myoglobin (Oxygen storing pigment) and copious supply of blood which facilitate continuous aerobic respiration. The muscles are immune to fatigue and works tirelessly from embryonic state until death.

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Knowledge Check

Cardiac muscles are highly resistant to fatigue because

A

a. numerous sarcosomes, high myoglobin and rich supply of blood vessels

B

b. numerous sarcosomes, less myoglobin and low supply of blood vessels

C

c. less sarcosomes, more sarcoplamic reticulum

D

d. none of these

Cardiac muscles are found in __ of the heart

A

myometrium

B

myocardium

C

myotome

D

all the above

If muscles are absent

A

Our bones have fast movements

B

Our bones have slow movements

C

Our body will become inactive

D

We will die

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