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morphology animals hinge symphysis saddle striated non striated contraction of muscle actin and myosin carbohydrates nucleic acids fats proteins enzymes cockroach muscular human digestive system structure of digestive system nutrition digestion physiology of digestion human nutrition histology of digestive system digestive system bones of the body human skeleton bones axial and appendicular skeleton ball and socket pivot joints of the body condyloid nervous floral formula and floral diagram liliaceae solanaceae fabaceae angiosperm families classification of fruits seed fruit infloresence flower reproduction in angiosperms double fertilization asexual reproduction in plants female gametophyte male gametophyte pollination reproduction in plants cardiovascular system lymphatic veins arteries heart circulation organization plants flowering roots leaf stem connective epithilium