shark organs Flashcards
what are pelvic claspers in Chondrichthyes?
male organ to transport semen
what are the cavities (coelom)?
pericardial cavity - cavity for the heart and lungs
peritoneal cavity - holds the digestive system
what did the cardiovascular system consist of?
singular circulatory system
atrium - ventricle - gills - rest of body
what consisted in the digestive system?
oily liver
spiral valve intestine
how was water controlled?
urea controlled osmoregulation
what was the purpose of the cloaca?
opening for the digestive and urogenital system
what is the female reproduction?
ovaries or ovary in dogfish
funnel
shell gland
isthmus
uterus
what is the male reproductive system?
testes - paired structures at the anterior dorsal end
enlarge during the breeding season
spermatozoa mature In epididymis
sperm stored in seminal vesicles
what occurs during oviparity (expulsion of egg)?
shell gland enlarge post fertilisation
secrete albumen nf collagenous fibrils as eggs pass through
what is viviparity
expulsion of live young
what is lecithotropy?
embryos retained in uterus but depend solely on yolk deposits
what is histotrophy?
embryo obtains protein and lipid-rich secretion from finger-like trophonemata in uterus
stingrays
what is oophagy?
embryo consumes later ovulated eggs
