The heart is myogenic (self-contractile) and autoexcitable, so it continues beating outside the body.
Smooth muscle fibres are elongated and spindle-shaped (fusiform), uninucleate, non-striated and involuntary.
Seminal vesicles are numerous small sacs on the ventral surface of the ejaculatory duct which store sperms.
Periplaneta americana shows spiral and determinate types of cleavage during embryonic development (Protostome feature).
Wall of intestine is made of smooth muscle.
Tendons are dense regular connective tissue.
Stomach lining is columnar epithelium.
Tip of nose is squamous epithelium.
Gap junctions facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.
In cockroach, Malpighian tubules extract wastes.
Uric acid is carried to the alimentary canal and passed out through anus.
The nitrogenous waste in haemolymph is mainly potassium urate.
Between the various sclerites, a flexible membrane called arthrodial membrane exists.
Tubular parts of nephrons are lined by cuboidal epithelium.
Inner surface of bronchioles is ciliated epithelium.
Buccal cavity moist surface is compound epithelium.
Areolar tissue is loose connective tissue.
Tendon is dense regular connective tissue.
Adipose tissue is loose connective tissue.
Cartilage is specialized connective tissue.
