In Pheretima, septa are absent between which segments?
3/4 and 9/10
4/5 and 8/9
5/6 and 7/8
7/8 and 6/7
In cockroach, larval and nymphal characters are maintained by
ecdysone
salivary glands
parotid gland
juvenile hormone
In frog heart, there are cardiac muscles which consists of fibres called
Purkinje fibres
myonemes
telodendria
columnae carnae
A.
Purkinje fibres
The heart wall of frog is composed of 3 parts: Epicardium, Myocardium and Endocardium.
Myocardium is composed of branched and striated yet involuntary cardiac muscles. The fibres of the self excitatory and conducting muscle of the heart are of three type- Nodal fibres, Transitional fibres and Purkinje fibres.
Malphigian tubules are
excretory organs of insects
excretory organs of frog
respiratory organs of insects
endocrine glands of insects
Inner lining of blood vessels is formed by
ciliated epithelium
squamous epithelium
cubical epithelium
columnar epithelium