- The document discusses the phylum Platyhelminthes, which includes flatworms. It describes their body structure, classes, and life cycles. Turbellarians are free-living flatworms, while monogeneans and trematodes are parasitic. Trematodes have complex life cycles involving snail and human hosts.
Giving overview of human embryonic development including spermatogenesis, oogenesis, fertilization, gastrulation, cleavage, extraembryonic layers and pregnancy
Giving overview of human embryonic development including spermatogenesis, oogenesis, fertilization, gastrulation, cleavage, extraembryonic layers and pregnancy
Chapter-3 Human Reproduction (NCERT)
A detailed presentation of the one of the important chapter of class 12. This chapter carries high weightage for both CBSE as well NEET examination
Chapter-3 Human Reproduction (NCERT)
A detailed presentation of the one of the important chapter of class 12. This chapter carries high weightage for both CBSE as well NEET examination
51. Visceral mass Mantle Foot Coelom Intestine Gonads Mantle cavity Anus Gill Nerve cords Esophagus Stomach Shell Radula Mouth Mouth Nephridium. Excretory organs called nephridia remove metabolic wastes from the hemolymph. Heart. Most molluscs have an open circulatory system. The dorsally located heart pumps circulatory fluid called hemolymph through arteries into sinuses (body spaces). The organs of the mollusc are thus continually bathed in hemolymph. The long digestive tract is coiled in the visceral mass. Radula. The mouth region in many mollusc species contains a rasp-like feeding organ called a radula. This belt of backward- curved teeth slides back and forth, scraping and scooping like a backhoe. The nervous system consists of a nerve ring around the esophagus, from which nerve cords extend. Figure 33.16