Muscular System of Humans

Which of the following substances are absent and present in smooth muscle cells?

Myoglobin helps in the transport of oxygen in _______.

All or none law is not applicable for

When the muscle fibres get excited, the triad allows releasing of ${\mathrm{Ca}}^{2+}$ ions.

Fill in the blank with the correct word given in the bracket.

There are two types of force-generating protein in a myofibril, i.e., actin and _____ (myosin/albumin).

In muscle contraction, this ion is essential:

Which one of the following proteins does not play a role in skeletal muscle contraction?

When the muscle fibres get excited, triad allows releasing of which ions?

Fill in the blank with the correct option provided in the bracket.

A triad system in the skeletal muscle consists of one transverse _____ (tubule, vesicle, sac) and two terminal sarcoplasmic cisternae on either side.

Fibrous membrane in the middle of a sarcomere is

Identify the correct order of stages in muscle contraction

Identify the part labelled as $\mathrm{B}$ in the above diagram of thin filament of a myofibril.

A - band in skeletal muscle doesn't contain:

Fibrous membrane in the middle of sarcomere is

Strongest muscles in human body are found in

Which yield $\mathrm{ATP}$ during muscle contraction?

Which of these statements about the molecular structure of myofilaments is true?

The long protein molecule, which masks the active sites on the $\mathrm{F}-$actin is

Which statement is correct for muscle contraction?

When a skeletal muscle shortens during contraction, which of these statements is false?