Striated and voluntary muscle fibres are found in

What is the state of sustained muscle contraction without relaxation between successive stimuli called?

Proprioceptors are present in . . . . . . .

Define the following terms:
$(1)$ Sarcomere
$(2)$ Acromion process

Rotation of the thigh on the lateral side is facilitated by:

Consider the following four statements $(a-d)$ and select the option which includes all the incorrect ones:
$(a)$ Skeletal muscle fibre is a syncytium as the sarcoplasm contains many nuclei.
$(b)$ In the centre of each $I$-band is an elastic fibre called $H$-line which bisects it.
$(c)$ In the resting state,a subunit of troponin masks the active binding sites for myosin on the actin filaments.
$(d)$ The contraction of a muscle fibre takes place by the sliding of the thick filaments over the thin filaments.