Write the difference between (Any two):
$(a)$ Actin and Myosin
$(b)$ Red and White muscle fibres
$(c)$ Pectoral and Pelvic girdle

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(N/A) Actin and Myosin
Actin Myosin
$(1)$ Actin is a thin contractile protein. $(1)$ Myosin is a thick contractile protein.
$(2)$ It is present in light bands and is called an isotropic band. $(2)$ It is present in dark bands and is called an anisotropic band.

$(b)$ Red and White muscle fibres
Red muscle fibres White muscle fibres
$(1)$ These are thin and smaller in size. $(1)$ These are thick and larger in size.
$(2)$ They are red in colour due to high myoglobin content. $(2)$ They are white in colour due to low myoglobin content.
$(3)$ They contain numerous mitochondria. $(3)$ They contain fewer mitochondria.
$(4)$ They perform slow and sustained contractions for a long period. $(4)$ They perform fast work for a short duration.
$(5)$ They generate energy primarily by aerobic respiration. $(5)$ They generate energy primarily by anaerobic respiration.

$(c)$ Pectoral and Pelvic girdle
Pectoral girdle Pelvic girdle
$(1)$ It provides skeletal support for the attachment of forelimbs. $(1)$ It provides skeletal support for the attachment of hind limbs.
$(2)$ It consists of two bones: the clavicle and the scapula. $(2)$ It consists of three fused bones: the ilium,ischium,and pubis.

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