Animal Tissue and Anatomy

The ejaculatory duct in males is formed by a union of the ampulla of the ductus deferens and the duct of the seminal vesicle. This duct receives secretions from the seminal vesicle and prostate gland and penetrates the prostate gland where it empties into the urethra.

Ans - 2

Ans - 1

The end organs of Ruffini are specialized sensory receptors located in the skin that respond specifically to heat. They are distinct from receptors for pressure (Pacinian corpuscles), cold (Krause end bulbs), and touch (Meissner's corpuscles).

The Aqueduct of Sylvius is a canal located in the midbrain that connects the third and fourth ventricles of the brain, not a structure found in the ear. The other options correctly pair a tissue or organ with a specific anatomical structure found within it.

The organ of Corti, located within the cochlea of the inner ear, contains the hair cells that act as sensory receptors for sound.

Vestigial organs are structures that have lost their original ancestral function. The vermiform appendix, ear muscles (auricular muscles), and the coccyx (tailbone) are well-known examples in humans.

The appendix is a small, tube-like structure attached to the cecum, which is the beginning of the large intestine.

The Haversian canals, a characteristic feature of the mammalian bones, are present in the matrix. The Haversian canals are interconnected by transverse canals called Volkmann's canals. 

Cochlea consists of three fluid filled chambers, the upper scala media, scala vestibule and scala media, which are separated by Reissner's membrane. 

Chloragogen cells of Pheretima posthuma is considered to be analogous to liver of vertebrates. Chloragogen cells are said to be excretory but their exact nature is not definitely known. Some zoologist are of the opinion that the chloragogen cells store the reserve food material and also manufacture glycogen form fatty acids. 

Archenteron cavity is found in gastrula. It is a primitive or embryonic digestive tube and communicating with outside by blastopore. 

Homologous organs are similar in structure and origin but not necessarily in function. Hence, organs from different species having a similar basic form, microscopic structures, body positions and embryonic development are said to be homologous. Homologous structures showing adaptations to different environmental conditions and modes of life are examples of adaptive radiation. The fossils of prehuman and ancestral human forms are obtained form widely diverse regions of Africa, Asia and Europe, which indicates that man's center of origin was probably in Asia and Africa. More precisely man has originated in central Asia because the number of domesticated animals and plants is maximum in Asia and the oldest known fossils have been obtained from Asia, China, Java and India. Climatic conditions in Asia and nearby places were most conductive for human evolution.

Ruffini ending or Ruffini corpuscle is a slowly adapting mechanoreceptor found in the cutaneous tissue of humans. It is named after Angelo Ruffini.This spindle-shaped receptor is sensitive to skin stretch, and contributes to the kinesthetic sense of and control of finger position and movement.

Scala media contains the organ of hearing, named organ of Corti. Organ of Corti is named after its discoverer Alfanso Corti. Organ of Corti rests on the basilar membrane and contains receptor hear cells, Deiter's cells (basal cells), cells of Hensen (supporting cells), etc.